Dlyfull Battery Tester, LCD Display Universal Battery Checker for Ni-MH, Ni-CD, Li-ion, Alk & LiFe04 Batteries(AA AAA C D 9V 12V 18650 CR123A 2CR5 CR2032 Cells), 2X AAA Batteries Included

I love this tester. I can handle any size battery and gives result in just a few seconds. It is very accurate and very readability. I like how it is made with big screen. The only thing that I wish it had is nice case or pouch to carry it in.

This is a great tester. This is my second unit. I bought one for my home. I just bought this one for my business. Any battery tester will tell you the voltage, but this one also analyzes the percentage of remaining power.

This seems to work, and is probably more accurate than less expensive voltage testers. Only downside is that it is a bit awkward to use; the positive terminal is on the device, and the battery must be held in a slightly awkward position for a few seconds to test. This is a minor issue most of the time.

This is a great alkaline and lithium flashlight battery tester. AAA, AA, C, D and watch batteries. Maybe more types but that is all I use it for. Good price, very easy to use. Check your batteries before recycling them.

This only gives you a consistent reading on alkaline batteries. I bought this primarily for testing Ni-MH and Ni-CD batteries and it’s completely useless with those. Test the same fully charged battery 5 times in a row in one minute and you will get wildly different results (85%, 15%, 50%, 70% and 10%). If you’re not getting this for alkaline batteries don’t waste your money. I missed the return window or this would’ve gone back as it’s useless to me.

I read about this device in an on-line article since I was in the market for a battery tester. I can't count the number of battery powered devices in my house and when one of them stops working the first thing I need to check is the batteries. I have a battery tester that is part of a battery storage tray but it's very rudimentary and permanently attached to the tray. I needed one that I can take to the malfunctioning device. The article I read pointed to a device that meets this criteria. I ordered this one based on the recommendation in the article. When it came in I was ready to try it with a number of batteries I had put aside for the purpose of checking out this tester. I used it to check various battery types (AA-Alkaline, AAA-Alkaline, Ni-CAD, L-ion). The results confirmed that the batteries were generally in the condition I suspected they were in. The readings displayed showed the terminal voltage and the percent of charge remaining. I worked as an electronics engineer designing test equipment so I'm always looking for inadequacies in stuff like this. I can say I have 100% confidence in the tester. If you have a lot of battery powered devices, get one. I'm glad I did.

I bought one for my father and one for myself. Within 1 hour of having it I saved time and money. The old man approves also so its a winner!

Working great so far!