Iphone 2G Problem With External back-up battery--Help Please

[goody921]

Hello...
I got the energizer energi to go back-up battery for iphone 2g (Jailbreaked)....
However, when I put the external battery on... the power meter increased, but no charge sign is appear....(I think it's just charge for the 1 second the time i put the charger on)....I don't think the iphone detect the back-up battery charger....
The iphone charge okay with the powerblock the came with the iphone...it just doesn't charge with the external back-up battery....

--I try the back-up battery on my friend's 2g iphone...it work fine....(his iphone detected the battery)....

Can anyone tell me what is wrong with my iphone,,and how can i fix it?


Thank you very much

 

[flyingember]

the 2G charges over usb + firewire pins.
the 3G and 3GS only charges over usb pins.
(different pins on the dock connector)

the backup battery device is likely firewire pins only, I have a car stereo this way

you need a new backup battery or an adapter
iPod & iPhone Accessories Power Charging Adapter
this works for more than just a cars I believe