The Lumsing 6000mAh External battery for ipad charger is one of the smaller portable battery chargers that I've used. With an advertised capacity of 6000mAh, it's not intended for real heavy use, but the tradeoff is the portability. The battery is only 4.9"x2.6"x0.4", and weighing only 6.6 ounces, it's no burden to carry it in a backpack or purse.
After charging the Lumsing to 100%, I used it to recharge my Kindle Fire HD 7" tablet and my Moto X phone, both of which were turned off during charging. In about 2½ hours, the Lumsing's battery was completely discharged; the Kindle Fire's charge was increased from 13% to 68% from the 2.1A outlet, and the phone's charge was increased from 13% to 90% from the 1.0A outlet. With the Kindle Fire's 4400mAh battery, that's an increase of 2,420 mAh; with the Moto X's 2200mAh battery, it's an increase of 1,694mAh,for a total increase of 4,114mAh. Dividing 4,114 by the Lumsing's 6000mAh capacity gives an electrical efficiency of 69%. That's actually very good for a small portable battery charger, since actual capacity is always significantly lower than the advertised capacity. (In a recent study of portable battery chargers, The Wirecutter - an electronic testing group - found the tested chargers' efficiencies ranged from 53-69 percent.) That's because using one battery to charge another battery is an inherently inefficient process, with a number of variables that affect efficiency. Doing a little more arithmetic, the Lumsing's 5V/2.1A output was recharging my Kindle Fire HD at about 1000mAh per hour, while the 5V/1.0A output was recharging my Moto X at about 700mAh per hour. Afterwards, I recharged the light weight external battery exhausted battery charger from an AC wall charger (5V/1.0A), which took about 6 hours.
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