I am familiar with 3.6V/4.1V and 3.7V/4.2V LiPo cells. I have a bunch of cells rated at 3.6V/4.2V. What's up with the odd rating? Can these be safely charged with a 4.2V charger IC such as the MCP73831?
This is all the info I have on the cells:
Models: Sony NP-FD1, NP-FT1, or NP-BD1
Nominal voltage: 3.6V
Maximum charge voltage: DC 4.2 V
Maximum charge current: 1.24 A
Typical capacity: 2.4Wh (680mAh)
(All three models have the same form factor and power specs but different keying; thanks Sony)
The battery voltage reads as 4.20V after being fully charged using the original charger. I opened up the charger and the charge control is being done by an M34501E4FP microcontroller so no clues there.