LiPo charge rates

xenon
Tags: #<Tag:0x00007fe22bdc9960>

#1

Does anyone know the LiPo charge rate for Xenon, Argon, Boron devices?

I’d like to use a smaller LiPo battery and smaller capacity batteries suggest lower charge rates. For example, this one from Adafruit suggests not charging at more than 150mA.


#2

I routinely see Xenons and Argons charge at 485 mA, 1,900+ mW.
Thats over a 3C charging rate for the tiny Li-Po you linked to.

With Borons, it depends on what firmware version you’re at, and “sometimes” your PMIC settings.


#3

Can you change the charge rate on the Xenon and Argon by chaging the charging resistor which sets the charging current limit.

It’s going to take a hot air rework tool or maybe a soldering iron with a small tip to swap out the resistor so beware.

The resistor is R17 on the Xenon I’m pretty sure.


#4

To answer my own question, the datasheet for the charging IC says

The charge current can be set by by connecting a resistor between Isen and Vss

It then proceeds to give a formula. R4 is currently a 2K resistor which should produce 500mA. A 665 ohm should work for 150mA. I’m averse to having a non-standard Xenon so I may try and make the 500mA version fit in my package.