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The charger appears to be well built and much easier to use than my La Cross BC-700U charger. The buttons have a solid click, the display is larger, back-lit and is very easy to read. It is nice that the charge rate of positions 2-4 are not limited to the rate chosen for position 1 although they all default to a maximum of 1000mA under certain conditions. Two cells can be charged at up to 2000mA (2 Amps). When the cells are being processed it is very easy to select a single cell and change mode and charge rate. I thought the fan was quite quiet. It can also test internal resistance which is a measure of a battery's ability to supply higher currents without significant voltage drops that would present as equipment shutting down even though the battery shows plenty of charge.
Verified purchase: Yes | Condition: New
so, i have a few chargers - this BT-C3100, a BT-C700, and a D4. while technically the D4 has the best charge termination function, this BT-C3100 is OVERALL a far better charger. being able to do capacity checks and output impedance checks on all types of batteries is key when trying to build "packs" or figure out which 2-4 batteries to group together for a certain device. good = features and functions, test a wide range of batteries, ability to do different functions per-slot average = charge termination isn't the ideal -dV/dt, but an alternate that works just as well for the most part bad = the fan can be "loud" if this is in your living room, but in a workshop it's totally irrelevant for MOST people (who only use AA and AAA batteries, either NiCd or NiMH), the BT-C700 is perfect. buy a few of those. but have at least ONE of these BT-C3100 to cover other chemistries and sizes "just in case"Read full review
Verified purchase: Yes | Condition: New
Feel real dumb having just bought a replacement low tech battery tester after losing my old Radio Shack one. This one tells me way more than pointing to red or green scales. It tells me voltage, capacity & resistance digitally. Plus, it charges all my rechargeables, Li-ion 18650, NiMH AA&AAA, smartly. Only a few bucks more than the old dumb analog tester from RadioShack. Wish I had done the Google group earlier. You can even buy a cheaper one from many brands if you don't need all the extra features this one offers. But heck, why not, for so little more. It can refresh: discharge & recharge, tells you the capacity in mAh, and whether the resistance is high: meaning aging & dying. Now I can retire all other tester & chargers.
Verified purchase: Yes | Condition: New
If you are familiar with this type of charger you will be most happy with its range of functionality and flexibility with the charging options / discharging and refreshing etc. There is little point in me listing these as they can be easily found on the Internet. A word of real CAUTION. Do NOT use the UK supplied power adaptor which comes with this. It is marked with a ce stamp BUT it is not fused and the terminal from the rear, to plug the EU two pronged power supply into, are unshielded and little flashes of electricity are observed when using it. Also it is not fused at all. Simply dump it and buy a proper eu approved shaver adaptor for the UK mains support, fused and safe to use. You can easily replace the fuse in those as well.
Verified purchase: Yes | Condition: New
This charger works well with these cells, but I do wish it could charge FOUR type 26650 cells at once, instead of only 2 in this size! (I had to buy 2 chargers, as I have an application using FOUR type 26650 cells, and desired charging all at the same time. A more powerful power supply, enabling charging 4 type 26650 cells simultaneously, at a 2 ampere rate each, (8 amperes total) would be a great addition to the line, if it had similar features as this unit, but had all slots large enough for 26650 cells, and higher charge capacity! The charger seems well made, and works well.
Verified purchase: Yes | Condition: New