In reply to jkarran:
Interseresting
I get quite a few tablets in for repair that need 'a new charging socket'. when tested these devices are perfectly fine its just that the owner has been using a phone charger instead of the proper, higher amperage one. Its a common mistake folk make and understandable but just because its a micro USB doesn't mean all chargers are the same. Its all in the output but they all fit the same socket physically so it becomes confusing. On a tablet that is on you'll often get the charging indication when a 500ma charger is put in but its delivering less power than the tablet is actually using. Not so bad if its on standby or switched off as the screen isn't taking any power let alone everything else, and the phone charger will trickle charge it, albeit slowly. Tablets also shut down down when battery level becomes critical and as charging is controlled by software, the phone charger isn't giving enough for the software to detect and initiate the charging circuit. Thats when they come to me and I just plug them in to a 2a socket and they charge up fine more often than not. In fact I have 2 or 3 2a wall chargers from wilkinsons (£6.99) to sell to frustrated tablet owners that all seem to lose the proper charger and use a phone charger instead because they think its the same. Did one Monday infact, nexus 7 - owner using wrong charger.
google 'blackberry playbook stack charging' to see how common the mistake is! People let the device slip below 20% charge and can't charge it unless they use a 2a charger or 'stack' it with a phone charger. What happens is you plug in phone charger, red light come on the tablet, 10 secs later the light goes out. what happened was the software sensed an amperage coming in but couldn't detect high enough increse of battery voltage to initiate the charging circuit so it reverted to 'dead battery' mode. Stacking is plugging in the charger and taking it out just before the red light goes out. you have to repeat this over and over again, 10 or 20 times but all those little 10 sec charge times you gave it are often enough to bring the battery back over the 20% threshold and normal charging can resume. They are a pain in the bloody arse!