This tester can not be used to test lithium batteries.
Test your AA, AAA, C, D, N-Size, 9 Volt, and button cell batteries
This battery tester measures your batteries and indicates the correct condition of the battery. It tests many batteries, such as AA, AAA, C, D, and 9 volt batteries, and features an easy to read display. This tester is capable of testing both rechargeable and non-rechargeable batteries. It's compact size allows you to store it nearly anywhere: Your tool box, the glove box in your vehicle, or even your pocket.
It is small / compact, and that makes it easy to store but difficult to use or handle.
I have 3 testers and 2 of them have failed because the label indicating what range was charged and discharged had come lose. The label was getting hit by the needle and causing the needle to stick until you tapped the meter slightly. It was reading everything as discharged because the needle couldn't get to the charged region. Basically, the label adhesive failed and the label curled up blocking the needle. However, When these guys work they are a great tool to help you decide when to toss or recharge your batteries.
It's a good Tester. It didn't come with instructions and took me a few minutes to figure out. It works well and is simple to use.
A handy small tool. A little tricky to hold the battery in place on the contacts, but once done a few, or several times, it becomes easier.
A very reasonable price.
We have several automatic feeders to feed our herd. When one of these fail it could be the motor, the timer, a bad switch a bad contact or just the batteries. Needless to say batteries are easiest and typically go first? There is no telling how many "Good" batteries that have been discarded due to the first process of elimination and not knowing for sure. This battery tester allows us to check them first and move on to the real problem. No doubt "these testers" I purchased will pay for themselves in time elimitating pre-mature discarding of good batteries.
I have found it difficult to find a simple small battery tester from any source. This little gadget works just fine and lets me know the condition of batteries I am using. The swing arm takes a little getting used to, but after I figured it out, it works just fine.