Opus BT-C3100 Charger/Battery Tester


  • $ 39.99
  • 12

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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

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William B.
United States
I recommend this product
  • 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.

Gary B.
United States
I recommend this product
  • What device/application do you use this with? I build and test flashlights and related parts, so I field test 3-4 times a week & use a lot of cells.

Definetly one of the top 4 Multi Chem. Chargers

This would be I believe my 8th Opus Charger and I also believe the Opus is in the top 5 multi chemistry chargers available currently, and most importantly to me it rates as very good with HJK of Lygte, which won't mean much to most but he would be the most reliable person to test and give an opinion on anything related to chargers or cells. Google BLF HJK Opus, This charger has a very simple U.I., it's dependable and accurate. I've never had one go haywire or cause a dangerous situation for me and I have never gotten bogus statistical results, but I have after hundreds of uses had bay 3 start acting up and that's when I know it's time to replace the unit. This charger also has a switch inside the case to charge 4.3 cells but I HIGHLY suggest leaving that alone unless you really understand what you're doing. Maybe I shouldn't have mentioned that, but it's there. I can usually get 2-5 years before I feel it's time to replace an Opus for whatever reason and I can't say that about many of the other chargers I've used. I run up to 8 chargers in a bank and charger hundreds of cells a month and I need them to be charged accuratly. I will continue to buy Opus and I will continue to buy them from Liion Wholesale a fantastic company.

Normand D.
I recommend this product
  • What device/application do you use this with? Headlamps, GoPro Pwr-XS and other toys designed by Cortex R&D Inc.

Still the best charger out there to me.

Versatile, well built and reliable

I recommend this product
  • What device/application do you use this with?

Really Good Charger

I had been using an eFest Luc 4 charger for the past few years and it worked well but was starting to show it's usage. I saw this one and really liked all the features that it offered. I have already refreshed some older batteries to bring them back to life. I like that it charges more than just li-ion batteries as well. I've only had this for a few weeks but I would highly recommend it. As always great prices and fast shipping!

Leisa K.
United States
I recommend this product

Opus BT-C3100 Charger/Battery Tester

This product works great and was shipped in good time. We have batteries on it every day and no problems. Nice product. Thanks

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