Power capacity - It will be the most important thing to consider with regards to the electric power bank unit. Everyone need to think about the better capacity charger of around 12000 mAh or higher total capacity of the power bank to store more electricity to re-charge your Android mobile phones, apple iphones, and tablets. Of course they are simply a bit more expensive than the usual power charger. For anyone who is looking for the reasonably priced but the good power storage capable power bank, you can go for the 3200 and up to 6000 mAh total capacity chargers.