SideKick has a small built-in Li-Ion battery to get you out of a jam, enough to keep you going for about two hours. If you need more juice you can pop on some AA, C or D alkaline/lithium cells. Please read our blogpost https://flintu.com/blogs/news/when-smaller-is-better if you’d like more information.
SideKick’s smart processor optimises the charge rate so your dead phone turns on quicker and stays on longer. In technical terms, it starts out charging at 1000mA and then gradually slows as the batteries deplete - this is so you stay connected longer.
SideKick has two modes: Storage and charge. Storage is indicated by three solid LEDs. Charge is indicated by moving LEDs. SideKick’s smart processor continuously monitors how much power is being transferred to your device and will adjust the speed of the moving LEDs - faster the better.