Common Problems About Power Banks Like Us on Facebook 1. Powerbank unable to charge my tablet? a) Powerbank with 2A output to charge tablets. While some tablets can accept lower input (1A or 1.5A), the charging is slower and sometimes can only be charged when the tablet is in sleep mode. b) Some tablet is cables might not be compatible with power bank due to different cable chipset design. For Samsung Galaxy Tab in particular, we recommend using the cable and connector meant for power bank (comes with some power banks. Heloideo White USA AC plug power bank with charging cable 2. Powerbank battery drained off very fast? a) Generally, a well maintained powerbank can retain up to 80-90% of its original capacity. Please check your device (phone/ tablet) original battery capacity and the powerbank capacity. Please also see answer 1.a. above. b) The number of times a powerbank can charge your device very much depends on the capacity of both the powerba...