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.

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.

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.

When in doubt, give in and view the videos about using it correctly. I bought this to check hearing aid batteries. The tester works fine when you know how, but not if you try to test them like a AA or a AAA batery. After I watched the videos I could test flat hearing aid batteries as well as AA and AAA. I was chuckling as I used it correctly after overcoming my stubborness. Thanks

Dlyfull Battery Tester, LCD Display Universal Battery Checker for Ni-MH, Ni-CD, Lithium etc.... It's not easy to find a battery tester that handles almost all the different batteries found in all the gadgets these days but this Dlyfull Battery Tester is up for the challenge. I particularly like the probe attaached which makes it so easy to test your battery. And the tester can handle a variety of different batteries including Alkaline, NMH, Lithium and rechargeable including speciality batteries in a variety of different tech devices. This was a good buy and it came with a standard quick check tester like the most common testers on the market.