Battery A1309 replaced but not charging properly

Hi

Got an MacBookPro 6.1 A1297 Unibody Mid 2010

old but great 17” display and it it was just pimped up with SSD .

I was lucky to get new looking “spare” battery from a friend

Replacement A1309

• Li-polymer 7.4V 11.2Ah
• SN: 9G925P26G4M0A (seems not a SerialNumber as other has posted same Number..)
• Manufacture: PS -
• Gerätename: CL5369
• Pack Lot Code : 4215 - PCB Lot Code: 111 (according CoconutBattery thats manufactured Sept 2015.. )

But I face similar problem as reported in many forums:

„SystemInformation“ shows only 36 cycles and 8259mV and „vollständig geladen“ JA / 100%.

The „verbleibende Ladung“ 10940mA looks great but it drops after a few minutes to 7% and system shuts down.

Whats strange that “Stromverbrauch” is indicate zero, but unfortunate the data in „SystemInformation“ are not updated automatically so information might be not accurate as system only charges / run a few minutes/seconds.

After connection MagSafe the system can be restarted, MagSafe connector turns Amber and „System Information“ indicate„ Batterie wird geladen“ JA-YES, but again after a few minutes it indicates already „full“ and MagSafe turns Green

I did the what AppleSupport recommends:

• Removed new Battery again
• Press „Power On“ button
• Connect Battery again
• Shift+Ctrl+Alt + power on button for 5 sec

Problem remains : (

I doubt that there is problem with PS or Mainboard as old Battery (already disposed) was at least charging and de-charging normal.

The Battery does not looks damaged and Voltage between Pin 1-5 against 9-13 shows 8.25V and between 7-8 against 9-13 shows 7.5V.

If it would be NiCa I would say its „Memory-Effect“.

But LiPo should not have that weakness ?! Might the un-attendance in storage cause other damage? Manufacture Date Sept 2015 - only 36 cycles..

I have Early 2011 MBP 8.3 with A1383 Battery manufactured Feb 2011 with 1033 cycles and that one still runs many hours.

So what went wrong with that “Replacement” Battery?

Is it typical for LiPo to keep Voltage (no load) but not store any energy anymore?

Sure if it charges only 5 min I can’t expect that Battery is getting ever full.

I guess there is some electronic - either in system or the Battery Pack which stop charging due to 8.25 V (max Voltage LiPo cell is recommended 4.2 according wiki)

I am wondering if nobody else has any hint or explanation ?

Can I open the Battery Pack and fix something?

Full Battery 100% but its drained after 1min

with attached MagSafe its charging “amber”

but after 5min it changes to “green”

How can I get the “Voltage” down which probably stops the charging?

Regards