Battery Capacity Tester Kit With Optional 18650 Battery Holder
Battery Capacity Tester Kit With Optional 18650 Battery Holder
Battery Capacity Tester Kit With Optional 18650 Battery Holder
Battery Capacity Tester Kit With Optional 18650 Battery Holder
Battery Capacity Tester Kit With Optional 18650 Battery Holder
Battery Capacity Tester Kit With Optional 18650 Battery Holder

Battery Capacity Tester Kit With Optional 18650 Battery Holder

We have 13 in stock.
Regular price$6.99
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Battery Holder
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This battery tester kit is your one stop for testing lead acid or rechargeable batteries. This kit includes:

  • Tester
  • Two resistors
  • OPTIONAL: 18650 battery holder with wire leads


Simply connect the battery holder leads and resistor to the appropriate connectors on the board, connect your 5v power supply, and let this analyzer test the capacity. This also works with rechargeable lead acid batteries.

The resistor gets hot during operation! We have used these extensively when testing 18650, prismatic and pouch lithium ion cells, and suggest using a cooling fan if you are going to be testing a lot of cells in succession.

This includes two 7.5 ohm 5-watt resistors for 500 mA (0.5 amp, use one resistor) or 1000 mA (1 amp, use both resistors) discharge rate. You can install additional resistors to up the discharge rate to 3 amps max.

This accepts a 5v input via micro USB connector. It can also be hard-wired by soldering to the '+' and '-' terminals on the underside of the board. Each board uses less than 70 mA current during operation, meaning that several can be connected to a single household 5v USB power outlet (power cable and supply not included).

Please contact us with any questions before purchase.


  1. Fully charge the battery before test.
  2. Connect input power first, then battery power. Connect resistor(s) to the outer two terminals, and battery positive and negative to the inner two. See markings on the underside of the board for proper connections. Reversing battery voltage will damage the tester!

  3. Press the '+' or '-' buttons to set cutoff voltage (in steps of 0.1v). Default is 3.0v with lithium ion (3.7v nominal) batteries.

  4. Press "OK" to begin testing. LED will start flashing three times, then begin testing. The readout will scroll through discharge current (amps), battery voltage (volts), and running capacity (Ah). A corresponding LED will flash for reference.

  5. When the battery voltage reaches the set cut-off voltage, the load control switches off and the total battery capacity (Ah) quickly flashes.

  6. Press the "OK" button to clear test results.

Error Codes

Err1: Battery voltage is above 15v
Err2: Battery voltage is lower than the termination voltage
Err3: Battery can not afford to load or discharge current line too much resistance
Err4: Overcurrent (current exceeds 3.1A)  


Power supply voltage: DC4.5-6V (micro USB connector)
Operating current: less than 70mA
Discharge voltage: 1.00V-15.00V 0.01V resolution
Termination voltage range: 0.5-11.0V
Supported current: 3.000A 0.001A resolution
Maximum voltage measurement error: 1% +- 0.02V
Maximum current measurement error: 1.5% +- 0.008A
Maximum battery capacity range: 9999Ah (1Ah = 1000mAh) greater value by shifting the decimal point to switch, when the display is less than 10Ah X.XXX, as shown above to achieve 10Ah XX.XX, and so on.
Board size: 50mm x 37mm
Finished Size: 50mm x 37mm x 17mm (length x width x height maximum position size, includes copper foot height)

We ship the majority of our orders by the next business day. Lithium batteries may take up to two business days to process to accommodate inspection and logging into our system.

Our shipping rates are based on the weight of all ordered products plus estimated weight of packaging. We make every effort to forecast an accurate shipping cost, but cannot be 100% certain in all cases. Please contact us at with any questions prior to purchase.

We pack and label all lithium battery shipments in accordance with Federal Regulation 49CFR173.185, as well as USPS Publication 52 Hazard Class 9 or UPS/Fedex guidelines. Unless otherwise stated, lithium batteries are not eligible for free shipping.

We try to pack all items in an order in a single box, however we may on occasion need to ship items separately. Special shipping does not apply to lithium ion batteries, and orders that include batteries may not qualify for free or expedited shipping.

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