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Possible to source brand new battery and connect up to old mobile phone?
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gizmo1990:
Hi everyone. I'm new to the forum and wasn't sure where to place this question, so I thought I'd play it safe and post it here. I'm gradually building my understanding of electronics with little projects here and there. I have an old Sony CMD-Z5 (circa 2000?) mobile phone which I still use daily as my foreign phone.



It has a rather unique battery design in that the battery is built into the back compartment itself, which snaps out to be replaced. I changed the battery about 8 years ago from new old stock, but obviously its hold of charge is pretty crappy.

Since buying any new old stock again would only be buying a battery which was already old, I was wondering could I crack open the battery compartment and wire up a brand new battery? The battery used is a Li-ion 3.6v 600mAh. Is something like this even possible?

Any advice much appreciated.



ace1903:
From the pictures seems that the battery is connected only with two wires. So no smart ID chip.
You can use a brand new battery that has the same capacity. Do not try to put a battery with a larger capacity because the internal charging circuit will not be capable to charge it properly.
Nice to see a phone from that era that still works properly.
Hope that GSM and 2G will not be abandoned soon as is the case in some countries.
NiHaoMike:

--- Quote from: ace1903 on January 22, 2021, 12:54:00 pm ---Do not try to put a battery with a larger capacity because the internal charging circuit will not be capable to charge it properly.

--- End quote ---
Not true, worst case if you fit a battery far larger than original the charger will time out and you won't get a full charge, but derating a battery will help to make it last longer.
gizmo1990:
Thanks for the replies everyone. I think I’ll open one up and see what’s inside then. :) The main problem looks like being able to source  a li-ion battery which is this slim. All the ones I’m finding currently are quite thick. I’m guessing a li-po battery couldn’t be used?
amyk:
It's almost certainly a standard lipo cell with 4.2V maximum charge voltage. Measure the dimensions, you can probably get a larger capacity one in the same size now.
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