Opus BT-C3100 Charger/Battery Tester


  • $ 39.99
  • 16 Reviews

SKU: opusbtc3100

This is the Opus BT-C3100 v2.2.  This is identical to the BT-C3400 that some other vendors are selling.  This is the most full featured charger we sell.  It can do all kinds of stuff in addition to just charging batteries, including testing and cycling them.  

This product is for advanced users only. We will not provide advice or technical support in using it to test your batteries.

Opus BT-C3100 Features:

  • 4 independent channels.  Most chargers have some channels connected together but not this one.  You can have each channel doing a different thing, one could be analyzing while another is charging, they could all be charging at different rates, the sky is the limit.
  • Internal resistance quick battery test mode checks internal resistance of batteries
  • Discharge testing up to 1A checks that your batteries really have as many mAh as they say they do.
  • Charging up to 2A per channel (up to 2 batteries) or 1A per channel (up to 4 batteries) allows very fast battery charging.
  • Refresh mode allows you to cycle batteries automatically
  • Charges Li-ion, NiMH, and NiCd
    • NiMH/NiCd sizes:  AAAA, AAA, AA, A, C, and SubC
    • Li-Ion Sizes:  10440, 14500, 14650, RCR123A (17340), 17500, 17670, 18350, 18500, 18650, 19670 (protected 18650), 25500, 26500, 26650, 20700 (including IJoy)
  • Can be set to 3.7V LiFeO4 charging or 4.35V high voltage li-ion charging by a switch on the PCB.  Default li-ion charging mode is 4.2V CC/CV.
  • Minus delta voltage charging for NiCd/NiMH reliable charging.
  • New backlit LED display tells you information

In the Box:

Customer Reviews

5 Based on 16 Reviews
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Thos. E.
United States United States

Opus Battery charger/tester

Another fine product from the fine folks at Lion Wholesale.

Thomas A.
United States
  • What device/application do you use this with? Charging and analysis of batteries.

Opus C3100

The perfect device for your batteries. You can’t go wrong with it. Buy it and you won’t regret it.

  • What device/application do you use this with? 18650 14500 flashlight batteries

Nice smart charger

Works great for 18650 batteries and gives you plenty of information while charging. Very versatile.

Dave F.
United States
  • What device/application do you use this with? 18650 batteries for flashlights.

Great Charger

Very efficient and informative about charging rates and overall battery conditions.

William B.
United States
  • What device/application do you use this with? none

Opus BT-C3100 Charger/Battery Tester

I’m happy with it, however the instructions are very Long and needlessly complicated.. No basic instructions on how to do the various functions. Perhaps it's in there somewhere but I couldn't find it. However I did watch several YouTube reviews on it. They were not as bad as the instructions but apparently they had just as much trouble as I did.. I Watched the best of the reviews twice before I figured it out.

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