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 Hale Ltd. is a small consultancy offering bespoke hand-crafted electronics, prototypes and curios.

Tuesday, 6 January 2026

New LiPo/LiFePO4 charger on Tindie

Frustrated with the cheap/common options for LiPo/LiFePO4 charging I've made a breakout for the BQ25186 so I could use it in a few prototypes.

The official TI evaluation board was impractically large and I needed a few to work with, so I made a batch. I've got plenty left over so I've put them up on Tindie as a product.

The BQ25186 is a double-edged sword: it offers pretty much complete control of the charging of the attached cell over I²C, but you must set/check that configuration any time your device starts. I've written and Arduino library for this as it's a likely use case for small hobby projects.

It does power path management and cell protection with control of power to the device over I²C or with a push button. So you get a soft on/off switch as well.

Another big difference over the cheap boards is that the USB connector has D-/D+ routed through to the headers so you can connect them to your dev board for programming etc. over a single cable.

I'm looking forward to using these in a few projects.