Mobile Phone Batteries

[imported_rod]

I'm thinking of building a USB mobile phone battery charger, and I'm just wondering if anyone knows anything about mobile phone batteries (especially Li-ion ones) and charging them.

I know some Li-ion batteries have built-incircuitry which controls charging, and all they require is a clean dc voltage. Do Mobile Phone batteries behave like this, or do they require charging circuitry and the like???

Thanks all
RoD

 

[kravmaga]

Hmm for backup USB batteries? My V3 charges over USB just fine. It's only when the battery is completely dead that I have to pull out the ac charger.

edit: Looking at my V3 battery it is Lithium Ion. So you just want to design some type of USB hub for spare batteries?

 

[imported_rod]

Dont worry, I bought one today and i've worked out how it works.

RoD