2S battery charging IC recommendation request

Thread Starter


Joined Oct 14, 2021
Hey everyone! We're working on a project where we need to charge up 2S li-ion battery with a charger/charging IC that can handle different types of power sources like USB, solar panels, and even a water turbine!

Basically, we need a charger that can pick the best power source available and keep our batteries safe while charging. If it already has safety features, great! But if not, we'd like suggestions for how to add them.

Here's what we need:

1- It should be able to use a USB 5V Input.

2- It should also work with solar panels. We found one we like [ https://www.digikey.com/en/products/detail/anysolar-ltd/SM351K09TF/14311422 ].

3- And it should work with a water turbine like this one [ https://www.amazon.com/gp/product/B095P35MZC/ref=ppx_yo_dt_search_siln_title?ie=UTF8&th=1 ].

Please someone expert let us know a charging IC that fit these needs, or if have any schematics or guides that could help us out, we'd really appreciate it! Thanks a bunch!

Audioguru again

Joined Oct 21, 2019
You do not say the mAh spec for the Li-PO battery that affects its maximum recommended charging current.
The water turbine says its output is low frequency AC not DC, does not say its maximum output voltage and does not say its output current.


Joined Nov 6, 2012
Along with the above requested information,
please include a detailed explanation of the performance that You will expect from your Project.


Joined Jan 23, 2014
There are some USB-C charging chips that will boost 5V to charge a 2S battery. Some are rated to handle a range of incoming voltages voltages. Here's one: https://www.ebay.com/itm/285395139469

If you have multiple power sources, use low-drop rectifiers to isolate them. I've used Schottky dual rectifiers salvaged from a junk switching power supply for that.