Comment by bigiain

A long time ago, I used to work at a place that decided to stick iPads onto meeting room doorways to display who had the room booked (because people are the worst). These'd last 7 or 8 months before the battery puffed up enough to be noticed, or in a few cases to crack the screens. I grabbed a few power point timer switches, and set them to only over up the charger for a hour a day. Never had another battery puffing failure - at last not in the next 2 or 3 years before I left. (As the iPads got old, charging for 1 hour per day wasn't always enough to keep them running 24x7, but I'd set them to start charging at 6am so worst case was someone needed to power up the iPad and start the room booking webapp on it in the morning. If a particular iPad got its battery into a state where that was happening regularly, we just adjusted the power point timer to charge twice a day, morning and evening.)