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Battery Capacity testers

I make a commission for purchases made with the links below
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After testing multiple battery capacity testers and blowing up a few (see below), this one has survived. I have used it to accurately test a multitude of various batteries and I love it!

The biggest downside is that you need to add your own wires and load. I usually connect an inverter and it works great. 

When your batteries BMS cuts off power to this unit, it has a memory and will save the results of your test. That means you do not need to worry about being present when the test is over.

Sponosored link to ebay:
Click here for to purchase

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I was scared to try these at first, but they rock! Dead simple and great tool for beginners to test the capacity of their individual cells or entire battery bank. Only downside is that it can only pull 15-22 amps max (185 watts), but it works well. It has high and low voltage disconnect settings for protection on single cell tests, and you can change the current to whatever you please.

Update: I destroyed mine when testing a higher voltage battery and pushing the current too high. Keep the current low when using this, and do not test batteries above 24V. 

Click Here for the aliexpress listing

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  • Home
  • DIY Solar Blueprints
    • Vehicle Mounted 12v Systems >
      • The Minimalist (great for small vans and cars)
      • The Classic 400 Watt (RV's, Vans, Buses)
      • 400 Watt w/ Alternator Charging
      • The Off Grid King (Power Anything!)
      • Ultra Sized Systems: Run an Air Conditioner
    • All-in-One 12/24/48V Packages
    • 48V Offgrid System Blueprint
    • Code Compliant 48V Offgrid System
    • Design Your Own Raw LiFePO4 System
    • DIY 24v Systems >
      • 2000 watt, 24v Solar System
      • 4000 watt, 24v Solar System
    • Grid-tie Systems
    • Other Packages >
      • Solar Trailer
      • Hand Cart Solar Power System
      • Minimalist on a Budget
      • Ground Mount Solar Array
      • DIY Beginner Friendly Solar Generator
      • 640Wh Milk Crate System
      • 12v Solar without a Battery
      • Pocket Solar Generator
      • Backpacking or Bicycle Tour Solar Package
      • Low Budget Package
      • Suitcase Solar Generator
      • Minivan Solar Power System
  • Solar Batteries
    • Lithium Batteries
    • 48V Server Rack LiFePO4
    • Raw LiFePO4 Cells
    • BMS
    • Sealed Lead Acid Batteries
  • Solar Components
    • 50-250W Solar Panels
    • 300W+ Solar Panels
    • Solar Panel Mounts
    • All-in-One 12/24/48V Packages
    • 48V All-in-one Buyer's Guide
    • Inverters
    • Solar Charge Controllers
    • Battery Chargers
    • Wire and Connectors
    • Fuses and Circuit Breakers
    • Battery Monitors
    • Battery Capacity Testers
    • Automatic Transfer Switches
    • Battery Isolators
    • Tools
    • 12v Fridges
    • Solar Friendly Air Conditioners
  • Plug-N-Play Systems
    • Full Size Systems
    • Ultra Portable Systems
    • How to connect Solar Panels to your Solar Generator
  • DIY Solar Book
  • Videos
    • Electricity for Dummies
    • Solar Power for First Timers
    • General Solar Education Videos
    • DIY LiFePO4 Video Series
    • Solar Wiring Configuration Diagrams
  • The Forum
  • Contact Me
  • Policies and Disclaimers