Hi all,

I want to build a small battery pack (self contained unit with charger and
variable output power supply). The charging will most likely be from an
input source of 5V (either 500mA USB source or 2A supply, but it shouldn't
really matter since it's all going through a switching supply). The battery
configuration will be 3 x 18650 Li-ion in series. The 18650s have a built i=
n
"protection circuit". I want to float charge these at around 4.1V, so is it
just safe to line the batteries up in series and apply a steady 12.3V? Woul=
d
I need 4.1V zener diodes across each of the batteries?
--=20
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