Battery health calculator

About the battery

V
Ah
Wh

Test settings

A
minutes

Test result

Equivalent capacity

12v 24v 36v 42v 43v 48v 72v

Instructions

For 12v, 24v, 36v or 48v batteries, use the white “motorlife” battery tester:
  1. Fully charge the battery
  2. Connect the tester to the mains
  3. Push “SET”, then push UP or DOWN to set the battery voltage, e.g. 36v
  4. Push “SET” again, then push UP or DOWN to set the discharge current (normally 10A)
  5. Push “SET” again
  6. Connect the battery (+ to red cable, – to black cable)
  7. Push “ON/OFF” to start testing
  8. When the beep sounds, make a note of the discharge time
  9. Enter the current (A) and run time (hours) numbers into the calculator
For 43v batteries use the black battery tester:
  1. Fully charge the battery
  2. Make a note of the start time on the timer, including the decimal point e.g. 5.7 hours
  3. Remove the cover from the tester to ensure it does not overheat
  4. Connect the battery (+ to red cable, – to black cable)
  5. Immediately make a note of the start current (top left on the display) e.g. 13.2A
  6. Leave the unit in a safe place where nobody will touch it and where nothing will fall onto it.
  7. After 30 mins or so, the battery will cut off. After this has happened, make a note of the end time on the timer, e.g. 6.2 hours
  8. Subtract the end time from the start time to discover the run time, e.g.
    6.2 – 5.7 = 0.5 hours
  9. Enter the current (A) and run time (hours) numbers into the calculator