Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay. Worked fine but the battery was only lasting a couple of hours, and would discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

This new battery performs similarly. When it gets to about 40% it can drain very quickly - maybe 10 minutes, low battery warning, then the Macbook shuts down.

I've tried a clean install of Monterey (12.7.4) and recalibrating the battery, and much the same.

Only slightly odd behaviour is login takes about 30 seconds from entering the password after restarting. This is the same behaviour with a clean install and a basic unlinked new account, and a fully iCloud linked install. Otherwise the machine works well.

I also swapped out the 128GB SSD with an ebay 500GB pull from a similar machine.

Any ideas, before I get back to the retailer?

--
Cheers, Rob, Sheffield UK

--- SoupGate-Win32 v1.05
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On 05/06/2025 06:45, RJH wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

This new battery performs similarly. When it gets to about 40% it can drain very quickly - maybe 10 minutes, low battery warning, then the Macbook shuts down.

I've tried a clean install of Monterey (12.7.4) and recalibrating the battery,
and much the same.

Only slightly odd behaviour is login takes about 30 seconds from entering the password after restarting. This is the same behaviour with a clean install and
a basic unlinked new account, and a fully iCloud linked install. Otherwise the
machine works well.

I also swapped out the 128GB SSD with an ebay 500GB pull from a similar machine.

Any ideas, before I get back to the retailer?

For your interest .....

https://chatgpt.com/share/68416277-f118-8013-bc86-8dbef3d9c089

HTH

--- SoupGate-Win32 v1.05
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RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

This new battery performs similarly. When it gets to about 40% it can drain very quickly - maybe 10 minutes, low battery warning, then the Macbook shuts down.

Some years ago I ordered a replacement battery for my white MacBook. Sadly the battery was barely any better than the one it replaced and the name of your supplier sounds familiar. Caveat emptor?

--
Cheers, Alan

--- SoupGate-Win32 v1.05
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On 05/06/2025 10:34, Alan B wrote:

RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would
discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

This new battery performs similarly. When it gets to about 40% it can drain >> very quickly - maybe 10 minutes, low battery warning, then the Macbook shuts >> down.

Some years ago I ordered a replacement battery for my white MacBook. Sadly the
battery was barely any better than the one it replaced and the name of your supplier sounds familiar. Caveat emptor?

Did you read the response from ChatGPT, Alan?

https://chatgpt.com/share/68416277-f118-8013-bc86-8dbef3d9c089

--- SoupGate-Win32 v1.05
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RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

Hmm, that gets my Chinesium spidey-senses going...

At least they freely admit they aren't a UK company:

"AolisiteCell Limited (Compnay No.77239929) Address: Room D07, 8th Floor,
Phase II, Kai Tak Industrial Building, 99 King Fuk St, San Po Kong, Kowloon, Hong Kong"

which may make returns awkward.

This new battery performs similarly. When it gets to about 40% it can drain very quickly - maybe 10 minutes, low battery warning, then the Macbook shuts down.

I've tried a clean install of Monterey (12.7.4) and recalibrating the battery,
and much the same.

Only slightly odd behaviour is login takes about 30 seconds from entering the password after restarting. This is the same behaviour with a clean install and
a basic unlinked new account, and a fully iCloud linked install. Otherwise the
machine works well.

Do you notice the machine getting hot? ie does the battery have the
expected energy in it but it's getting wasted somewhere, against not storing the energy in the first place?

I would try a few full 100% to 0 cycles first - charge it up full and then
let it run normally until it shuts off. When it shuts off, try to power it
up again and see if you can get any more runtime. Do this until it refuses
to turn on. Then charge to 100% and repeat.

I had similar behaviour with a new (genuine) Lenovo battery, and it turned
out it just needed to learn the battery capacity. After a few days of use
it sorted itself out.

I also swapped out the 128GB SSD with an ebay 500GB pull from a similar machine.

Shouldn't be a problem - if you feel the underneath you'd feel it being
unduly warm if the SSD was sick.

Theo

--- SoupGate-Win32 v1.05
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Theo <theom+news@chiark.greenend.org.uk> wrote:

RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would
discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

Hmm, that gets my Chinesium spidey-senses going...

At least they freely admit they aren't a UK company:

"AolisiteCell Limited (Compnay No.77239929) Address: Room D07, 8th Floor, Phase II, Kai Tak Industrial Building, 99 King Fuk St, San Po Kong, Kowloon, Hong Kong"

Yep that looks like the company I dealt with. I tried all the usual stuff you mentioned: a few full 100% to 0 cycles, but to no avail.

which may make returns awkward.

I never bothered - lesson learned! Their street address says it all ;-)

--
Cheers, Alan

--- SoupGate-Win32 v1.05
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Alan B <alanrichardbarker@gmail.com.invalid> wrote:

Theo <theom+news@chiark.greenend.org.uk> wrote:

RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would >> discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

Hmm, that gets my Chinesium spidey-senses going...

At least they freely admit they aren't a UK company:

"AolisiteCell Limited (Compnay No.77239929) Address: Room D07, 8th Floor, Phase II, Kai Tak Industrial Building, 99 King Fuk St, San Po Kong, Kowloon,
Hong Kong"

Yep that looks like the company I dealt with. I tried all the usual stuff you mentioned: a few full 100% to 0 cycles, but to no avail.

which may make returns awkward.

I never bothered - lesson learned! Their street address says it all ;-)

For the record, I've heard of ReplaceBase as a good UK source of parts -
it's what independent repair shops use for parts, which is why they have a strong trade distribution arm.

https://www.replacebase.co.uk/huarigor-extended-life-macbook-pro-13-a1502-replacement-battery-pack-a1493-a1582-7000mah

seems fair pricing to me.

(I've bought an iPhone battery from them but not actually got around to
fitting it. So can't vouch for the quality personally)

Theo

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On 5 Jun 2025 at 10:56:03 am BST, "Theo" <theom+news@chiark.greenend.org.uk> wrote:

For the record, I've heard of ReplaceBase as a good UK source of parts -
it's what independent repair shops use for parts, which is why they have a strong trade distribution arm.

https://www.replacebase.co.uk/huarigor-extended-life-macbook-pro-13-a1502-replacement-battery-pack-a1493-a1582-7000mah

seems fair pricing to me.

(I've bought an iPhone battery from them but not actually got around to fitting it. So can't vouch for the quality personally)

Prices certainly ok and looks generally less iffy than many! We have several old iphones and an mbp coming up for battery replacement, so thanks for that. --
TimH
pull tooth to reply by email

--- SoupGate-Win32 v1.05
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On 5 Jun 2025 at 10:41:23 BST, Theo wrote:

RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would
discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

Hmm, that gets my Chinesium spidey-senses going...

At least they freely admit they aren't a UK company:

"AolisiteCell Limited (Compnay No.77239929) Address: Room D07, 8th Floor, Phase II, Kai Tak Industrial Building, 99 King Fuk St, San Po Kong, Kowloon, Hong Kong"

Well, yes, agreed! But then pretty much all of this sort of stuff comes from somewhere in East Asia - even Apple originals.

which may make returns awkward.

I'm pretty sure they have at least a UK distribution hub - it arrived in a day or so. It's more the hassle and melting all that glue again that I'm not looking forward to.

This new battery performs similarly. When it gets to about 40% it can drain >> very quickly - maybe 10 minutes, low battery warning, then the Macbook shuts >> down.

I've tried a clean install of Monterey (12.7.4) and recalibrating the battery,
and much the same.

Only slightly odd behaviour is login takes about 30 seconds from entering the
password after restarting. This is the same behaviour with a clean install and
a basic unlinked new account, and a fully iCloud linked install. Otherwise the
machine works well.

Do you notice the machine getting hot? ie does the battery have the
expected energy in it but it's getting wasted somewhere, against not storing the energy in the first place?

It has its moments - unexplained activity, even after switching off Spotlight, and no photos. The battery utility list Clock and Calendar as using energy - not sure how, why, or how much. But most of the time, cold. Good thinking as something to watch.

I would try a few full 100% to 0 cycles first - charge it up full and then let it run normally until it shuts off. When it shuts off, try to power it up again and see if you can get any more runtime. Do this until it refuses to turn on. Then charge to 100% and repeat.

I had similar behaviour with a new (genuine) Lenovo battery, and it turned out it just needed to learn the battery capacity. After a few days of use
it sorted itself out.

Yes, I'l lstick with it for a while. I've only done about 5 cycles with a lot of faffing about in between.

I also swapped out the 128GB SSD with an ebay 500GB pull from a similar
machine.

Shouldn't be a problem - if you feel the underneath you'd feel it being unduly warm if the SSD was sick.

I'll watch it a little more closely, thanks.

Rob

--- SoupGate-Win32 v1.05
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RJH <patchmoney@gmx.com> wrote:

On 5 Jun 2025 at 10:41:23 BST, Theo wrote:

RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would >> discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

Hmm, that gets my Chinesium spidey-senses going...

At least they freely admit they aren't a UK company:

"AolisiteCell Limited (Compnay No.77239929) Address: Room D07, 8th Floor, Phase II, Kai Tak Industrial Building, 99 King Fuk St, San Po Kong, Kowloon,
Hong Kong"

Well, yes, agreed! But then pretty much all of this sort of stuff comes from somewhere in East Asia - even Apple originals.

Indeed, but it doesn't mean that every seller from there is selling the
genuine article. Fakes are a real problem.

which may make returns awkward.

I'm pretty sure they have at least a UK distribution hub - it arrived in a day
or so. It's more the hassle and melting all that glue again that I'm not looking forward to.

Yes, but:
https://www.macbatterystore.co.uk/help/return.aspx

"30-Day Money-Back Guarantee
Returns are accepted within 30 days from the date of receipt.
The product must be in its original condition, with complete packaging and accessories, and must not have any signs of damage or tampering.
If the return is due to a quality issue, supporting evidence (photos or videos) must be provided.
Refund requests without relevant product information (such as original model and issue description) may be
denied."

The third and fourth points are contrary to UK law: you can make a return
for any reason and you don't have to provide evidence. In UK law you
have to inform them within 14 days and return within 30 which is slightly stricter than the above.


"5. Fees & Costs
A. Returns & Exchanges for Non-Quality Issues
2 Order Shipped (Customer-Initiated Reasons, e.g., ordered by mistake, changed mind)

Refusal to accept the package is not allowed. If the customer refuses the package, it will be treated as abandonment, and no refund will be issued.

If a return is needed, please contact our customer service within 30 days
after delivery, and ensure that the item is unused and in original
packaging.

The customer is responsible for the following costs:

Original shipping cost
Return shipping cost
10% restocking fee"

Err, no, UK law doesn't work like that. A full refund is due including original shipping cost. The buyer pays the return shipping cost.


"9. Return Address
Name: RE GBLONA C967224
Address: Leicester Commercial Park Unit 1, Dorsey Way, Enderby, Leicester, GB, LE19 4DB
Phone number: 7760674644"

That's the address of their dropship warehouse, run by Cainiao UK Supply
Chain Limited (4PX EXPRESS UK CO LTD).

If you google for "C967224" it comes up with quite a number of somethingbattery.tld sites in different countries. I suppose they must use
4PX warehouses internationally for logistics.

At least they don't ask you to return a lithium battery to Hong Kong
(basically impossible due to dangerous goods regulations).


Looking at Trustpilot it seems they can be slippery about the 'supporting evidence' they will accept for an RMA. Which is something you have no obligation to provide.

I wonder if they'll also be slippery if the battery has been glued in.

Do you notice the machine getting hot? ie does the battery have the expected energy in it but it's getting wasted somewhere, against not storing
the energy in the first place?

It has its moments - unexplained activity, even after switching off Spotlight,
and no photos. The battery utility list Clock and Calendar as using energy - not sure how, why, or how much. But most of the time, cold. Good thinking as something to watch.

It sounds like it's not running down the battery unduly, ie fans on turbo,
case hot to the touch. Which suggests it's a battery capacity/charging/discharging issue rather than an energy consumption
problem.

Theo

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Mark <captain.black@gmail.com> wrote:

On 5 Jun 2025 at 11:38:05 am BST, "TimH" <thnews@poboxmolar.com.invalid> wrote:

On 5 Jun 2025 at 10:56:03 am BST, "Theo" <theom+news@chiark.greenend.org.uk>
wrote:

For the record, I've heard of ReplaceBase as a good UK source of parts - >> it's what independent repair shops use for parts, which is why they have a >> strong trade distribution arm.

https://www.replacebase.co.uk/huarigor-extended-life-macbook-pro-13-a1502-replacement-battery-pack-a1493-a1582-7000mah

seems fair pricing to me.

(I've bought an iPhone battery from them but not actually got around to
fitting it. So can't vouch for the quality personally)

Prices certainly ok and looks generally less iffy than many! We have several
old iphones and an mbp coming up for battery replacement, so thanks for that.

There's also https://www.thebookyard.com. I haven't used them, but I know they've been mentioned on here before (although maybe not for a few years), and they've been around since 2007

For this laptop: https://www.thebookyard.com/parts-retina-macbook-pro-13.php?cPath=39_1263_393&sort=2a&filter_id=6

They appear to only have refurb batteries, and are out of stock. I can see
the merits of buying used OEM batteries, especially as aftermarket can be
such a lottery, but I wouldn't be buying grade 3 (50-75%) state of health - those are approaching their cycle life and could fail before too long. My recent Lenovo I swapped out was still working at 66% SoH and had puffed up inside the case meaning it was about to fail.

Grade 2 (75-90%) still have a bit of life in them, although with already a
lot of cycles under their belt - I think it's much better to look for a new battery.

Also, in this particular laptop removing the battery involves ungluing it,
and I'd be wary of buying a used battery that had been through that process
- more chances for mechanical damage.

Theo

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On 05/06/2025 06:45, RJH wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay. >Worked fine but the battery was only lasting a couple of hours, and would >discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

This new battery performs similarly. When it gets to about 40% it can drain >very quickly - maybe 10 minutes, low battery warning, then the Macbook shuts >down.

I've tried a clean install of Monterey (12.7.4) and recalibrating the battery, >and much the same.

Only slightly odd behaviour is login takes about 30 seconds from entering the >password after restarting. This is the same behaviour with a clean install and >a basic unlinked new account, and a fully iCloud linked install. Otherwise the >machine works well.

I also swapped out the 128GB SSD with an ebay 500GB pull from a similar >machine.

Any ideas, before I get back to the retailer?

The problem with buying a new battery for an old laptop? They've often been
sitting on a shelf for years. It recently took me two attempts to get a
good enough replacement for the seven year old corporate Dell that is still
very much fit for purpose (thanks to my employer going overkill on the
specs when they bought it).

--
A PICKER OF UNCONSIDERED TRIFLES

--- SoupGate-Win32 v1.05
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Jason H <jason_hindle@yahoo.com> wrote:

The problem with buying a new battery for an old laptop? They've often been
sitting on a shelf for years. It recently took me two attempts to get a
good enough replacement for the seven year old corporate Dell that is still
very much fit for purpose (thanks to my employer going overkill on the
specs when they bought it).

True, that's a reason not to buy 'new old stock' OEM batteries, and where aftermarket can actually be better.

In the days that Samsung smartphones had removable batteries they stopped making them about a year after the phone was released. So after a few years all you could buy was very elderly 'new old stock' that had sat on the shelf for years or 'genuine Samsung' fakes. I concluded the best battery to buy
was with a brand on the side that wasn't Samsung: by having someone else's
name on it, it wasn't an ancient remnant and it wasn't a fake.

(if you're going to make fake AA batteries you get more profit from faking Duracell than you do faking Tesco, so the Tesco branded one is more likely
to be legit. Maybe Tesco performance/quality isn't as good as genuine-Duracell, but it's going to be better than fake-Duracell)

Unfortunately third party brands for laptop batteries are a bit thinner on
the ground than for phone batteries.

Theo

--- SoupGate-Win32 v1.05
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On 5 Jun 2025 at 14:22:40 BST, Theo wrote:

RJH <patchmoney@gmx.com> wrote:

On 5 Jun 2025 at 10:41:23 BST, Theo wrote:

RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would >>>> discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

Hmm, that gets my Chinesium spidey-senses going...

At least they freely admit they aren't a UK company:

"AolisiteCell Limited (Compnay No.77239929) Address: Room D07, 8th Floor, >>> Phase II, Kai Tak Industrial Building, 99 King Fuk St, San Po Kong, Kowloon,
Hong Kong"

Well, yes, agreed! But then pretty much all of this sort of stuff comes from >> somewhere in East Asia - even Apple originals.

Indeed, but it doesn't mean that every seller from there is selling the genuine article. Fakes are a real problem.

which may make returns awkward.

I'm pretty sure they have at least a UK distribution hub - it arrived in a day
or so. It's more the hassle and melting all that glue again that I'm not
looking forward to.

Yes, but:
https://www.macbatterystore.co.uk/help/return.aspx

(snip useful summary of the returns fiasco)

TBH I'll try it on, more along the lines of 'the world will know', see if they feel shame, if not - let it go. ICBA!

Do you notice the machine getting hot? ie does the battery have the
expected energy in it but it's getting wasted somewhere, against not storing
the energy in the first place?

Not really, I've watched it more closely since the last full charge a couple
of days ago - about an hour's use and the battery's drained.

It has its moments - unexplained activity, even after switching off Spotlight,
and no photos. The battery utility list Clock and Calendar as using energy - >> not sure how, why, or how much. But most of the time, cold. Good thinking as >> something to watch.

It sounds like it's not running down the battery unduly, ie fans on turbo, case hot to the touch. Which suggests it's a battery capacity/charging/discharging issue rather than an energy consumption problem.

Well, it looked shiny and new. My theory is that it's been 'resleeved' - an
old battery/controller that's somehow been reset (it was showing zero cycles when I got it), and had a new cover glued on. Using the coconut utility, and looking at the system report, it was manufactured in 2015.


--
Cheers, Rob, Sheffield UK

--- SoupGate-Win32 v1.05
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RJH <patchmoney@gmx.com> wrote:

TBH I'll try it on, more along the lines of 'the world will know', see if they
feel shame, if not - let it go. ICBA!

Could always write them a snotty Trustpilot review if you get nowhere. And claim on your card too, especially if they refuse a return for spurious reasons.

Do you notice the machine getting hot? ie does the battery have the
expected energy in it but it's getting wasted somewhere, against not storing
the energy in the first place?

Not really, I've watched it more closely since the last full charge a couple of days ago - about an hour's use and the battery's drained.

That does sound like a worn battery.

Well, it looked shiny and new. My theory is that it's been 'resleeved' - an old battery/controller that's somehow been reset (it was showing zero cycles when I got it), and had a new cover glued on. Using the coconut utility, and looking at the system report, it was manufactured in 2015.

:-( Probably salvaged from e-waste. I suppose some things like the cycle count might be reprogrammable.

There might a clue from the writing on the chips - there may be a date code.

Theo

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Alan B <alanrichardbarker@gmail.com.invalid> wrote:

Theo <theom+news@chiark.greenend.org.uk> wrote:

RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would >>> discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

Hmm, that gets my Chinesium spidey-senses going...

At least they freely admit they aren't a UK company:

"AolisiteCell Limited (Compnay No.77239929) Address: Room D07, 8th Floor,
Phase II, Kai Tak Industrial Building, 99 King Fuk St, San Po Kong, Kowloon, >> Hong Kong"

Yep that looks like the company I dealt with. I tried all the usual stuff you mentioned: a few full 100% to 0 cycles, but to no avail.

which may make returns awkward.

I never bothered - lesson learned! Their street address says it all ;-)

I have a 2017 MBP my daughter gave me with a dying battery (showing
‘service battery’ warnings) and various crashing issues. I think she’d been
running it with an underpowered PSU.

I only needed it for desktop use, replacing my old iMac, so I just left it permanently plugged into a more appropriate PSU. After a while it sorted
itself out, and has been showing as ‘good’ for over a year now. Although I haven’t really run it on battery much (probably more frequently due to
power cuts).

The MBP was clever enough to go into a ‘desktop’ mode, so manages the battery at about 80% charge (it’s at 77% life, which it’s maintained for some time too).

Don’t know if that might help, try leaving it plugged into power for a
couple of weeks or so (or longer if you can perhaps).

--
Andy H

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On 13 Jun 2025 at 19:26:02 BST, Andy H wrote:

Alan B <alanrichardbarker@gmail.com.invalid> wrote:

Theo <theom+news@chiark.greenend.org.uk> wrote:

RJH <patchmoney@gmx.com> wrote:

Recently bought a Apple MacBook Pro 13-inch Retina A1502 (Early 2015) on eBay.
Worked fine but the battery was only lasting a couple of hours, and would >>>> discharge over about a week if left to sleep.

So I replaced it with:

https://www.macbatterystore.co.uk/apple-battery-replacement-macbook-pro-13-inch-retina-a1502--early-2015-.htm

Hmm, that gets my Chinesium spidey-senses going...

At least they freely admit they aren't a UK company:

"AolisiteCell Limited (Compnay No.77239929) Address: Room D07, 8th Floor, >>> Phase II, Kai Tak Industrial Building, 99 King Fuk St, San Po Kong, Kowloon,
Hong Kong"

Yep that looks like the company I dealt with. I tried all the usual stuff you
mentioned: a few full 100% to 0 cycles, but to no avail.

which may make returns awkward.

I never bothered - lesson learned! Their street address says it all ;-)

I have a 2017 MBP my daughter gave me with a dying battery (showing ‘service battery’ warnings) and various crashing issues. I think she’d been
running it with an underpowered PSU.

I only needed it for desktop use, replacing my old iMac, so I just left it permanently plugged into a more appropriate PSU. After a while it sorted itself out, and has been showing as ‘good’ for over a year now. Although I
haven’t really run it on battery much (probably more frequently due to power cuts).

The MBP was clever enough to go into a ‘desktop’ mode, so manages the battery at about 80% charge (it’s at 77% life, which it’s maintained for some time too).

Don’t know if that might help, try leaving it plugged into power for a couple of weeks or so (or longer if you can perhaps).

Thanks, got to be worth a try.
--
Cheers, Rob, Sheffield UK

"Men who believe absurdities will commit atrocities."
-- Voltaire

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