should've upgraded USB charger, with 42.5Wh battery it'll take ages to recharge

... it's 70% more battery - expect 2 times longer recharge

, imagine how long take if charge usb port of mac/pc

when i'm @ friend's house trying recharge ipad old pc adds 20% overnight

 

the thing can ipad charge faster bump amperage, needs stay 5v remain within usb spec.

reason ipad takes long charge on old pc ... because you're charging on old pc. usb ports on older pcs tended have low amperage, that's same reason many bus-powered portable hard drives won't work on old computer usb port.

 

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