Battery Life
The SafePower S5 delivered over 703 minutes of power in our intensive ‘real world’ tests, earning fourth place among all large-size chargers tested. Discharge rates were also good, and on par with category averages.

Power/Size
The SafePower S5 also scores well for power:size and power:weight ratios, earning fourth place among large size chargers for power-per-cubic inch, and third place for power-per-ounce.

Durability
Durability for the Zilu SafePower S5 is average but not outstanding. The battery is housed in a plastic casing that is solid and with no obvious design issues. The SafePower S5 weathered impact tests better than some competitors, but did not perform as well as more durable devices. Overall, durability is good, and the SafePower S5 would be an excellent choice for general/everyday use and leisure travel.

Features
The Zilu SafePower S5 sports integrated 1 and 2.1 amp USB ports, power level indicators, and a small LED flashlight.

Value
In terms of value, the SafePower S5 scores very well, placing third among all large-size chargers tested, and third among all devices tested, regardless of size or category.

Gear Institute Battery/Power Test Results
Discharge rate:.4% per minute

Overall battery life:703 minutes

– Per cubic inch:53.81 minutes

– Per ounce:73.23 minutes

– Per cubic inch/ounce:5.6 minutes

– Per dollar:28.13 minutes