TYLT Energi Sliding Power Case Galaxy S4

Got this one of the last times Woot had it. Bottom line - you get what you pay for. The case battery is **not **powerful enough to fully charge the phone even once. The whole getup gets uncomfortably hot while it charges the phone. And this “phone charges first” feature is not exactly as it seems. Yes, the phone charges first, but it does so by charging from the case. If your phone is low battery, and you plug the whole thing to a power source, the case battery will be drained when the phone is fully charged, requiring you to leave the case plugged in for more time - and it charges extremely slow for such a small capacity.

So bottom line - it’s good in a pinch or if you don’t have the money to spend on a good external battery. If you’re a real road warrior - stay away from this baby