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 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.

It is an excellent item at a great price, well packed, and delivered promptly with no issues. The seller is an A+++ on Amazon!

Seems to be working ok. The instruction booklet could be more helpful. I was confused at first because the display does not show anything, there is no on/off switch. There is 1 button I had thought would serve that purpose but it does not, it turns on the display very briefly and then shuts down. Ignore the button and just put the battery positive on charger and use the tester stick on the negative, then the display will show.

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.

Worked at first, now everything I test says it is a dead battery. No way to test internal batteries...plus why does it need batteries?!! This thing is as sketch a stripper that says she loves you.

I saved time and money the day I received battery tester. I checked all my batteries laying around and found most of them still at 100%. This was a great buy.

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.

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.