Battery Tester for AA AAA C D 9V etc 12 Types & Household Batteries Checker

This works great for all of my various batteries to see how much life is left in them. I'm thinking of getting one to use for my church. I do wish that the polarity of the test points was reversed. It swould make checking the batteries easier.

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.

Easy to use and read results. Definitely value for the cost. So glad I found this on Amazon.

I purchased this Dlyfull Battery Tester in Oct. 2025. I may have used it once or twice a month. By July 2026 it stopped working. I replaced the batteries, thinking they ran out of juice, but it still would not work. The device kept giving a "malfunction" reading.

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.

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.

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.