I bought this charger as replacement for the original one which was not recognised by tablet any more ("slow charge" problem). When TheTechTree charger arrived I was happy to the slow charge message has gone. However it clearly is not powerful enough to do the job properly. When I go to bed and plug the thing in I expect to see fully charged tablet in the morning but it's not. It's still charging. I can recommend it only as last hope charger. Or as good charger for smaller device such as phone, don't try as Raspberry Pi power source - not powerful enough.