General > General Technical Chat

Fitting Li-po battery to mobile phone. Possible? Easy?

(1/2) > >>

ThunderZed:
I'd just want to know if it's possible to supply a common mobile phone with a 2 wired 3.7V Li-po battery like this one instead of its proper Li-ion battery, eg this one.
If yes, how?

kjr18:
That one Nokia type battery you showed has a 82kohm resistor between GND and third connector. It is called BSI - Battery Size Indicator. Some newer batteries will have more connections, like cell temperature. I think new phones (mainly smartphones) use batteries that have built-in chips that monitor battery and relay all this information via some sort of data connection, I2c, 1wire or something like that. It all depends on what battery you want to replace.

ThunderZed:
Exactly the BL-5C I pointed to. I'd like to adapt/fit/arrange a Li-po battery instead of it to supply an old Nokia phone that carried that Li-ion battery on, if possible and easy.

Nusa:
A mobile phone with an easily removable battery is no longer "common"....they're mostly history now. But one of the things people liked about those replaceable batteries was the ability to replace the battery with a space charged ones as required.

SiliconWizard:

--- Quote from: ThunderZed on April 10, 2022, 04:07:23 pm ---I'd just want to know if it's possible to supply a common mobile phone with a 2 wired 3.7V Li-po battery like this one instead of its proper Li-ion battery, eg this one.
If yes, how?

--- End quote ---

I suppose so. First thing will be to go there: http://www.cpkb.org/wiki/Nokia_BL-5C_battery
As said above, you need to connect a 82k resistor between the BSI pin and ground to emulate this battery. Second thing is that the original battery is about 1000mAh, whereas the one you pointed to is half of that. Third thing is that the original battery is very likely a Li-ion battery with a 4.1V max voltage, as opposed to 4.2V for a typical LiPo battery. Note that in this direction it should not be an issue, the internal charger will just not charge the new LiPo to its full capacity. But I'd suggest getting a similar capacity so that battery life will be similar, and the charging current will be adequate. Also, with half the capacity, the phone will probably not estimate the state of charge properly.

So, get a 1000mAh battery to begin with.

Other than this, I think it has good chances of working. Those "old" batteries did not contain electronics with identification (along with a fancy connector), as more recent batteries do.

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod