very convenient, good size and good finish

What is expected of a battery backup?
_taille not too imposing, small footprint
_charge fast in one direction or the other
discharge out _no use
_suffisante to load at least one or more unit
_sans risk to the device
FYI, the greater the capacity in mAh is important and will allow the battery to recharge a device, but its size and weight will increase, most of the time. For a device with a strong mAh, so you need a powerful battery, ideally above that of the device you want to recharge. To give an idea, I frequently use a light 4200mAh battery to keep the load on my Kindle Fire for watching videos when it is low. In this case the backup battery does THAT maintain the charge but the battery charge 80% of the unit to standby when I put up at 25%.
_the 18 month warranty reminds one is dealing with a serious manufacturer but not had the opportunity to test return
level security, the battery is equipped with Smart technology that makes the trip out in case of overheating.

This voluminous small backup battery provides a good load 10400mAh for double output up to 2.1 A with the following characteristics:
_a light with 4 LEDs for the integrated charge in the on / off button of the torch
_a small led flashlight extra than enough to move in the dark
_Two outputs: one ordinary and a fast 1A to 2.1A
_câble but not supplied microUSB wall charger

Concerning its dimensions: 80x140mm and 2 cm thick. A heavy weight for its size. And it is a bit big guy for a bag but it's still reasonable.

It is well in vertical or horizontal position, which I find convenient (especially vertical).

I made a wise calculation that allows me to estimate the duration of illumination with the LED on full battery around 650 hours (both say that the LED is more likely to release the battery and can get lost long time without risk of not being informed).

I came to end after three tablet expenses (Kindle Fire so little greedy and that I charge to 30%) and two full loads of my iphone. I plugged in the evening around 22H and it was fully charged in the morning around 8 am when I looked.

Good product and very good quality / price ratio. 18 months warranty. The device comes loaded but the wall charger is not supplied.