Opus BT-C3100 Charger/Battery Tester


$ 39.99
24 reviews

SKU: opusbtc3100

This product is eligible for further discounts depending on how many you buy! You can purchase other products in the same category (batteries, chargers, or accessories) and it will add to the wholesale discount. Add some products to your cart to test!

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
4.9 Based on 24 Reviews
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derek s.
United States United States
  • What device/application do you use this with? Flashlights, bike lights and weapon lights.
Good value for the money

Nice, full featured charger that's pretty hard to beat for 30 bucks. The fan on mine is intermittently noisy but it doesn't really bother me because getting a nicer charger will probably cost substantially more money.

United States United States
  • What device/application do you use this with? Flashlight
100% great product

This works great charges batteries better than my old charger plus brings old batteries back to life well worth the money and a great deal will buy again.

James Z.
United States United States
Better Than The Newer Charger

This charger is MUCH MUCH better than the newer version. The batteries fit much more securely in this charger. This charger comes with a C and D size adapter, where the new charger DOES NOT. This is a GREAT charger. Don't even consider anything else.

Jeremy T.
United States United States
  • What device/application do you use this with? Cells
Great charger

really awesome charger. Love the IR test. It actually works!

Frank L.
United States United States
  • What device/application do you use this with? DIY battery pack
battery tester - restore

works as stated

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