Battery Tester +
![Battery Tester](https://files.ozbargain.com.au/t/60/33560.jpg?h=1c6fbc9c)
A battery tester is an electronic device intended for testing the state of an electric battery, going from a simple device for testing the charge actually present in the cells and/or its voltage output, to a more comprehensive testing of the battery's condition, namely its capacity for accumulating charge and any possible flaws affecting the battery's performance and security.