More Choices， More Power.Double the ChoicesADD was created with the concept of customization. Select the amount of power you need for any situation. A day would only use up 4，500mAh (one primary pack) and a two day trip would take 9，000mAh (one primary + one supplementary).

Product Details
Innovative Design
The stackable design gives more choices. The ADD can be 4，500mAh， 9，000mAh， or even 13，500mAh!

Smart Technology
The order of the battery use allows for the primary pack to always have power when needed most. When the supplementary pack is added， the ADD uses the supplementary pack’s power first before using the primary pack. When charging， ADD charges the primary pack first then the supplementary.

Ingenious Charging
ADD can be charged together or separately. Separately， it takes around 5 hours to charge rather than the usual 9 hours for batteries of the same capacity. When connected to the supplementary pack， the primary pack serves as a battery life indicator for both packs using separate color lights.

No More Waiting!
Equipped with a 2.1A output， the ADD will charge your smartphone in just 1-2 hours. It is compatible with Apple and Android devices as well as mp3 and select gaming devices.

Specification :
CAPACITY : 9，000mAh
HEIGHT : 2.8 inches (7.0 cm)
WIDTH : 5.4 inches (13.8 cm)
DEPTH : 0.6 inches (1.6 cm)
WEIGHT :7.69 oz (218 g)
INPUT CURRENT : 2100mA
OPERATING TEMP : 5 - 45 degrees celsius
INPUT VOLTAGE : 5.0V +- 0.25V (DC5V)
OUTPUT CURRENT : 2100mA
CELL TYPE : Li-Polymer
OUTPUT VOLTAGE : DC5V