I recently purchased a SCE7640 rechargeable powerpack so that when i am away from a socket i can charge up my phone for a while when it inevitably runs out of juice.

I found a nice deal (£26.99) and waited for it to arrive. I charged it up and then plugged in my n900 and nothing happened, it didnt look like it was charging and low and behold later in the evening the phone died with no battery.

I then plugged the philips into my Blackberry storm and it charged that OK, my friends Samsung mobile phone was charging OK too.

Does anyone have any idea as to why the N900 will not charge with this device but all the other things seem OK?

I have tried it with both the nokia usb cable a cheapo usb cable from eBay, same result with both.

TIA

C