The Mini-9RL Multi Battery Tester from ZTS is a microprocessor-controlled instrument that quickly lets you check a battery's remaining power capacity using a fully automatic, pulse load test. It takes roughly two seconds, and the percentage of remaining capacity will be indicated on the LED display.

Battery types are clearly labeled next to appropriate contacts and this tester works with over 12 different batteries, including NiMH, lithium, lithium-ion, alkaline, and more. The unit runs on four AAA batteries and features a probe and lead wire, which conveniently stores away in the seam.