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

It arrived quickly. It's easy to use and works great! I already had one for the office and decided it was time to buy one of my workshop.

This DLYFULL B4 battery tester is a must-have if you check a lot of rechargeable batteries or any other type of batteries. I also went over the tester and used white-out with a brush, and then wiped excess off using WD-40, sprayed on a napkin, and it took the residue off (because it was hard to see the # displayed on the unit), leaving it with white numbers that you can see clearly. This is the best battery tester that I have used so far. I found this tester easy to use, too. If you're looking for a good battery tester, look no further. I found this tester to be very accurate and worth the price.

Unusual battery tester. Place the positive end on the proper pin on the unit, then take the coiled lead and touch the negative end of the battery. Two handed job. Display will wake up, quickly test battery and give you a numerical percentage read out and a bar graph read out. It has been pretty accurate so far. The battery types are molded into the tester next to each pin, but could use some white filler material to make them stand out and easier to read. Unit uses an internal battery, 2 AAA. It can self-test it and remind you when to replace it. Four stars rating: hard to read markings for the battery types on the unit case, and the display shuts off just moments after you remove the battery you are checking.

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.

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

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.

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.

I tested product. While it works, I found it difficult to use. I prefer the other testers I purchased later. I did keep product, but don't recommend.