Every year, our power needs grow. Tablets get bigger, phones get more needy. Portable power is pretty much a must for anyone travelling or for someone that works away from a power source all day.
The good news is – there are hundreds (if not THOUSANDS) of choices for portable external battery chargers. The bad news is – they are not created equally and may not reasonably meet the needs you bought them for.
When buying an external battery like the RAVPower 15000mAh PB-19(from now on, just PB-19; about $40 from Amazon), you need to consider four major things; how long it will last, how powerful is the output, what sort of quality of battery are you getting inside – and finally, how long will it take to recharge?