How to check the battery? Quality and suitability of batteries. The battery (galvanic cell), as well as any electrochemical power source (accumulator), is characterized by tension (electromotive force - EMF) and capacity. Capacity cannot almost be measured directly, but it is possible to estimate it in size of most given current in the mode of short circuit. As to make it by means of a universal tester (multimeter), it is shown in this video.