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How to choose the right power bank

2400mAh/34.56Wh 14.4V Dji RSG37 Li-ion battery for DJI Ronin-S BG37 Grip Gimbal Stabilizer

3150mAh/12.13WH 3.85V/4.4V Condor BGN610 Li-ion Cell Phone battery for Condor BGN610

2000mAh/7.6WH 3.8V/4.35V Coolpad CPLD-349 Li-ion Cell Phone battery for Coolpad Ivvi K1 K1-NT

2500mAh/9.5WH 3.8V/4.35V Bq bq_battery_2500mAh Li-ion Cell Phone battery for BQ E5.0/0759/0858/0760

What is a mobile power bank, and why can they charge the device?

2850mAh/10.83WH 3.8V/4.35V Bq 2850 Li-ion Cell Phone battery for BQ Aquaris E5-4G/0982

3000mAh/11.52WH 3.84V/4.4V Infocus HE313 Li-ion Cell Phone battery for InFocus HE313

Autel MS906 laptop Adapter ,MS906 Adapter for Autel Maxisys MS906 MS906BT MS906TS MS908 MS908P

Acer PA-1700-02 laptop Adapter ,PA-1700-02 Adapter for Acer S220HQL G196WL S190WL

Is the charging speed related to the length of the cable?

6100mAh/22.57WH 3.7V/4.2V Lenovo L12D2P31 Li-ion Tablets battery for Lenovo IdeaTab s6000 S6000-F S6000-H

4500mAh 16.65Wh 3.7V/4.2V Fuhu SP5067112 Li-ion Tablets battery for Fuhu Nabi DreamTab HD8 DMTAB IN08A

37Wh/2707mAh 3.83V/4.35V Microsoft A3HTA023H Li-ion Tablets battery for Microsoft A3HTA023H 1ICP3/71/98

2.89Wh/755mAh 3.83V Microsoft A3HTA021H Li-ion Tablets battery for Microsoft A3HTA021H