I'm an Electrical Engineer, and this device looks well built. I tested the efficiency and it goes to about 90% or more, this is good, it wont heat up during charging, and voltage is accurate so it wont kill you battery. Efficient running also means the charger will last a long time.
For better lifespan, disconnect the charger once you're done charging. and only charge the batteries when you're gona use them. there is no need to leave it plugged in for many hours after is has done charging. Leaving the battery plugged after charging will "slowly" over charge it, and slowly kill it making it fail prematurely. Same goes with your phone and any other lithium battery.
4/30/2016 9:40 AM
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