General > General Technical Chat

Charging Cell phone form a 9V battery

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hamster_nz:
Might be worthy of discussion... (but not really).


james_s:
I mean obviously it would work, but it's a very expensive way to get a partial charge into a phone. Maybe if you're stranded somewhere with a mobile phone, car charger and a pile of 9V batteries?

MosherIV:
If you look at the capacity of a 9v battery and the capacity of the battery in the phone, you woul realise that the 9v battery would give less tha a few % to the phone.

tooki:
And that’s before the losses incurred in the car lighter plug, many of which use a linear regulator to burn off the excess voltage as heat!  |O

Twoflower:
The picture says in case of Emergency. I think it might be possible to charge the phone from dead-as-doornail to able to call a rescue team. Other than that: I totally agree not very useful.

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