So two questions.
1) I've just bought a 13000mAh (13 thousand) portable battery pack. How long will it take to charge using a conventional IPad wall adapter? (I think they're rated at 2A, 5V making it 10W).
2) how long will it then take to charge a device like an iPad from 0 to 100% using the portable battery pack?
Also (sorry I know this makes it three) I live In the UK and my uncle from the states shipped me an iPad from over there and I'm using a two pin to three pin adapter, does this reduce efficiency at all? Should I buy a three pin adapter from apple? (Cause those nasties are extortionate)
It's an iPad 4 btw.
Thanks a lot.