Hi, I have tried to post this in one of the older threads, but not have an answer yet.
If anyone is using Lipo Rider Plus or similar with a 5V boost output on usb-A or board pins: I have the following:
I’m using the Lipo Rider Plus with relatively small Li Ion/LiPO batteries (250-350 mAh) and Arduino Nano Matter connected to a 5V booster output on type A connector in my projects. I have also a a physical (latching) switch to turn the power on/off to Arduino after 5V output. All batteries I have, include integrated PCM/BMS modules (they all do) providing all sorts of protections. However, after a while batteries stop charging. On the board only 4th green LED blinks with 3 solid LEDs which hints on almost fully charged battery.
However, after testing the batteries - they all have discharged below 3V cut-off, when the circuit is left to rest for couple of days to a week and some even discharge to 0V completely, without any load - the switch is off. When this happens the battery “refuses to be charged” - when connected to usb-C external charger again, Lipo Rider board applies 4.2V at the battery pins but no/trickle current is flowing for charging. Which is not surprising as battery is now in over-discharged state and PCM stops it from charging.
My question, how is this possible (discharging below 3V safe cut-out) with no load connected (switch is off on Arduino and even if nothing is soldered to the output)? Battery protection circuit should stop discharge at 3V. How it is possible for Lipo Rider to slowly discharge it over time to below 3V? I tried many different batteries and I have 20 different Lipo Rider boards - they all do the same.
PS. My guess it is a 3V-5V booster has something to do with that as our internal toggle board switch for 5V is always on.