This unit has everything you need unless you are a complete battery nerd. Time will tell on longevity but very impressed with the apparent quality, functionality and features. You will be hard pressed to beat it for price. It's also quiet and doesn't have lots of repetitive beeping, fine to have it charging in the bedroom
Verified purchase: Yes | Condition: New
The OPUS BT- C3100 Analyzer test Charger does all of the operations as described. It is easy to operate and gives accurate readings as to the capacity of the battery being tested. You can charge and test 18650 , AA and AAA batteries and other slim batteries that will fit. It will charge and test sub C and C size cells but D size cells are too big in diameter to make a connection with the contacts. A handy device to check and charge your batteries.
Verified purchase: Yes | Condition: New
Will test resistance, capacity and charge lithium batteries...has a function to charge, discharge and check mha then recharge...has overtemperature , that stops charging so it does not get too hot..up to 2000ma charge rate on 2 slots and 4 x 1000ma..can program individual slots...only complaint is it hangs around 4.2v for a long time before discharging, not sure why , could be waiting for temperature...a safe and reliable charger.
Verified purchase: Yes | Condition: New
This charger is easy to use. It can charge all types of rechargeable cylindrical batteries and different types at the same time. It is also great for testing and rejuvenating the batteries. It can also charge batteries quickly. No waiting overnight to charge your batteries.
Verified purchase: Yes | Condition: New
My old Opus BT-C3100 v1.0 died after 5 years of everyday use charging and even reviving my standard AA and AAA batteries and also my 18650 and 21700 batteries. Does everything you need and has an in built fan which most units don't for cooling. Highly recommend for anyone who needs a quality charger that's reliable and has every function.
Verified purchase: Yes | Condition: New
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