Lithium Ion Battery Upgrade Question

[markferrino]

I'm pretty new to this.

I have a voice recorder with a 3.7v 850mah lithium ion battery. I'd like to solder in an upgraded replacement that has a capacity of 2000mah (also 3.7v).

Afterwards when I plug it in to charge, will it charge the new battery to full, or do similar such devices typically include something that governs/limits the amount of charge to that of the original installed [850mah] battery (i.e. programming in the ic, for example, etc)?

[JohanH]

I've done this on a couple of devices and it's worked fine. It's unlikely that such devices monitor battery capacity. But you probably won't know until you try.

[MrAl]

I'm pretty new to this.

I have a voice recorder with a 3.7v 850mah lithium ion battery. I'd like to solder in an upgraded replacement that has a capacity of 2000mah (also 3.7v).

Afterwards when I plug it in to charge, will it charge the new battery to full, or do similar such devices typically include something that governs/limits the amount of charge to that of the original installed [850mah] battery (i.e. programming in the ic, for example, etc)?

Hi,

Just make sure you get a battery with welded on tabs don't solder to the battery.  You can then solder to the tabs.

[BradC]

As other have said, it'll be fine. It'll take longer to charge and it'll run for longer. I've even put upgraded cells in a laptop that has the capacity hard coded into the BMS. It just takes longer to reach 100% and it sits at 100% until it discharges to about the original capacity, then starts to drop off. Strange, but does the job.

[AndyBeez]

Open up the target board and take a look at what chip is providing the charge control function. Most charge control chips including the jellybean TP4056 set maximum charge current with a programming resistor (R_PROG). For a bigger battery capacity you might be able to up-rate R_PROG at the same time.

[markferrino]

Thank you all for your help. I'll give it a shot and see how it goes.

@MrAl I'll be sure to solder to the tabs of the battery

@AndyBeez Way beyond my understanding, but appreciate your advice nonetheless.