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!

found it hard to read the size. numbers and letters need to be different color-white - to make it user friendly .

It worked as promoted.

The first one I received produced wildly inaccurate readings for each NiMH battery I tested. The replacement was just as bad as the first one. When I test the same battery five or six times in a row, each reading was different. From reading to reading I would get: 1.20 V, 1.16 V, 0.96 V, 1.05 V, 1.10 V. I used a high-quality digital voltmeter to check the same battery and got 1.26 V every reading. I tried testing the battery with the voltmeter in parallel with the battery tester, again the voltmeter would read 1.26 V every time and the battery tester would be all over the place. I did try testing some alkaline batteries using the alkaline terminal, those readings were more consistent and only slightly lower than the voltmeter. Trying a few other battery chemistries, it seems the problem is mostly with accurately measuring NiMH batteries. For a device like this to be useful it needs to achieve two goals: one accurately read the voltage and two repeat the same reading each measurement. Both devices that I tested did neither.

The large LCD display is easy on my old eyes without chasing down reader glasses. Smartly engineered so it stays in place during testing sessions, but compact and light enough to stow away easily. The coiled hide-away wand is a clever solution for managing the test lead wire — beats the tangle of alligator clip wire leads I always had wrapped around my previous tester. Two inexpensive AAA batteries power this tester vs. the pricey pair of less commonly available button batteries that my old tester used insures much longer and more economical juice life. Easier for my shaky old fumble fingers to install too.

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.

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.