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

Works well. I appreciate the accuracy.

Very easy to use, good price for what you can test with this. Needed this for 18650 and CR123A batteries. Battery tester, has a strange glitch when you test a new type of battery it reads error, but if you try again it works fine. Only seems to do it when you haven’t used that battery type before. I have nothing else to check the accuracy but brand new batteries read correctly.

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.

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.

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.

This is an excellent battery tester able to test a wider variety of batteries than I expected. It is surprisingly easy to use and read the readout.

Most expensive battery tester I ever bought, but I like it

Comes with no instructions, there is no off or on switch, cylinder batteries have to be tested with matching the positive contact to the tester, witch just doesn't feel right, the Tester is a little spendy , but does show testing for rechargeable and standard batteries, it seems to work OK.