Bean+ Fully Charged Battery Voltage reads 4.22v

mcfly 2017-02-08 21:55:33 UTC #1

Hi. I recently charged my Bean+ until the amber light disappeared, indicating a full charge. I started a low-power sketch (sleeps a lot) and have been taking voltage readings with a new multimeter approximately every hour. The multimeter indicated the starting voltage was 4.22v. After 24 hours, it is now down to 4.17v.

The question is on the voltage level itself. Everything I have read indicates the Bean+ has no voltage regulator, and that anything above the max value of 3.9V would fry it. However, the built-in LiON battery seems to charge up to 4.22v itself. How is this not a problem for the Bean+ ?

Regards.

mcfly 2017-02-08 21:57:48 UTC #2

Forgot to mention. I am taking a voltage reading with the multimeter from the positive (red) and negative (black) wires coming out of the built-in LiOn battery itself (on the underside of the Bean+)

mcfly 2017-02-09 01:47:20 UTC #3

Hi all - sorry for the newbie question. I found my answer: "The Bean+ has a rechargeable lithium-ion polymer (LiPo) battery which stores 600mAh of power and operates from from ~2.45 and 4.20 volts, depending on its state of charge." Everything I had been reading was for the 'Bean' and not the 'Bean+'.

Cheers