Battery low warningThe media comany I work for presents their IOS apps on local fairs from time to time. I had reports from the ladies presenting the apps on iPads, that they were not charging or even discharging despite being plugged in.
On siteHaving nothing better to do on a Friday afternoon, I drove to the fair, equipped with a few spare iPads and power supplies, to see for myself what was going on.
It took me a few minutes to dig my way into the three vandalism-proof iPad stands and get hold of the power supplies. A closer examination of the power suppies made things clear:
Different power ratingsAlthough Apple has it on their web site, I was not aware of the fact that there are three different power supplies out there. All looking the same.
|spot the difference|
The power ratings (top-to-bottom) are 12W, 10W and 5W.
Watts: Better to look at them, than to look for them.The 5W adapter apparently came with an iPad mini, while the 10W adapters are for all iPads without retina display.
With a 10W adapter, an iPad with retina just seems to be able to hold it's charge at reduced screen brightness. A 5W adapter is just useless to keep an iPad retina on constantly.
I replaced all chargers with 12W models. All iPads charged up ok, leaving some happy people to work through the weekend on the fair.