>>340699The two cells are in series through the protection/balancing circuit, presents itself to the charger as an 8.4V pack.
Charger's configurable to 8.2 or 8.4V depending on the anode chemistry. Any higher and the protection circuit kicks in.
Even the datasheet says not to go over 4.2 per cell iirc.
Most of the time it's fine though. Even if the charger faults, the device is still around 80%, which for all but one or two occasions a year is pleeeeeeeeenty of power for what i'm using it for.
The 2400mAh's, derated for temperature, put me at a little lower runtime than what I wanted. The cost difference between the 3400 and 2400mAh cells wasn't enough to even bother with. (Got a smokin' deal on those NCR18650B's.)
