Additional batteries and external battery chargers

[wibble]

The battery used will be identical to the Samsung J7 3000mAh battery.

A quick search shows quite a variable size of the battery for "the" Samsung J7, depending on
year and full device name. And given suffices like neo, duos, etc, I may have missed a few more sizes.

The BJ700 and BJ710 are the common ones, so the BJ700* for the 2015 J7 might fit.

size in mm                                  capacity        example dev   Samsung part
76.17   x 63.23 x 4.71 mm        3000mAh      J7 2015          EB-BJ700BBC / BBE / CBE / ...
100.12 x 48.56 x 4.90 mm        3300mAh      J7 2016          EB-BJ710CBC / CBA / ...
85.88   x 39.50 x 4.30 mm        3000mAh      J7 Neo 2017   EB-BJ731ABE / ...

(names and interestingly "exact" sizes as mentioned in ebay listings, unverified; and I've no idea about user-visible diffs between e.g. BBC, BBE).

Luke, can you give exact device name or battery part name?

thx
\Freff he replied

76.17   x 63.23 x 4.71 mm        3000mAh      J7 2015          EB-BJ700BBC / BBE / CBE /

 When I contacted a vendor asking about the size of his ' J7 '  battery,

*  His reply was that there is more to be concerned with than just size.

Apparently there are chips in the batteries with firmware that must agree with your particular phone...?

He 'suggested' using batteries that were approved by your particular manufacturer...  errr  ? ?

UNLIKE my truck,  I just get the biggest/ highest rated that will physically fit in it.

I guess the circuitry in a cell phone is more particular  ?

**  Is there a particular model of phone we can compare the Pine phone to,  to 'match-up' the battery  ?

THANKS

I have no expertise in this area but I have heard of some OEM batteries that might contain the NFC component/aerial for a phone.
And the cheep "Chinese knockoffs" only provide the battery part itself with no NFC.

Subsequent fitment of the knockoff battery might make the basic phone work ok ... but not the NFC function any more.

That might be what is meant by checking "the battery chips".

A phone battery is rarely just a battery, especially if it's user replacable. At a minimum it's likely to have a temperature sensor of some sort so it can be shut off if it gets too hot. It may have under/over voltage protection and overcurrent protection built in. It may include a battery state monitor chip to give more accurate battery info. It cold even contain something like they have on printer cartridges to try to stop people using 3rd party batteries, or to stop the battery charging unless it's in an approved device - IIRC Panasonic did this at one point with their camera batteries. The supplier's general point that the battery being the same physical size isn't the only thing you need to worry about is valid. The coulomb counter in the openmoko gta02 battery vs. the thermistor in the physically similar Nokia bl5c is a well documented example