Batteries are commonly tested using either a multimeter or a battery tester. Each machine offers the capability to tell whether or not a battery has enough power to be used on a device or if it can be recharged. Battery testers are a lot easier to use as opposed to a multimeter, however, multimeter tools offer more accurate voltage readings.
In order to correctly test a battery, it must first be put under a usable load. Standard battery testers do this without assistance and will let a user know if the battery still has any useable power left. However, a multimeter allows for approximate readings. Use the following instructions to correctly check whether or not a battery has any power.
- Turn the multimeter to DC
- Place a resistor between test leads
- Place jumper wires on the battery
- Read the multimeter
A battery uses DC power. Make sure the multimeter is set to read DC voltage.
Use a resistor in between the two test leads on the multimeter and the battery. This will allow the battery to be put under load, so the multimeter can accurately read its voltage.
Place two wires from the resistor to the battery.
Read the numbers on the multimeter. If there is no change, then the battery is dead and no longer usable.