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

I love this tester! It tests so many different types of batteries! The pulse testing gives a much more accurate reading of what what's actually left in the battery. It gives a percentage read out that is far more helpful than a needle gauge. A similar tester is 4-5 times more expensive and doesn't have the LCD readout. If you need a battery tester, buy this one!

great gadget and will save you money. I have lithium batteries in my cameras. Lithium batteries can last an unbelievable amount of time but you should always know the life of it. I almost replaced mine at 3years only to find out they were at 45%!! this will save you some money. Batteries are still going and its been 5 years lol

First, I purchased this unit. This is not a Vine review. The unit seems to work if you double check the batteries. When checking a battery, (even a brand new battery) most of the time its shows 95% capacity, not a 100%. If you then recheck the battery it will show 100%. I don't know what procedure they use to determine capacity, but I believe they are putting a load on the battery to check it. This is good because it gives a better reading. As an example, I checked a 23A battery with a multimeter and got reading of 11.56 volts. When I checked it with this checker it showed "ERR" and no capacity. The Dlyfull unit was right. The Multimeter has a high input resistance, and therefore did not load the battery. This tester loaded the battery and give a better reading. Why you have to check the battery twice is annoying, and I don't know if this is something in the unit design, or I have defective unit. This also happens with rechargeable batteries. It would nice if the unit would check AA, AAA Lithium batteries. This unit tests more accurately then the standard battery checker. This will tell you if the battery in your remote, or other product, is good and can supply the current your product needs. Would I recommend this unit? Yes. Even with the problems it better then a standard checker.

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.

There's a self check button. The first unit indicated "Err" and went blank. I filed a return request and asked for a replacement. The second unit has the same problem. I tried it with the batteries it came with, and with known good ones. This thing is junk. Does not work at all. Obviously, they don't test them in the factory.

Works great. I have a lot of confidence in this device. It is useful on a variety of single-use and rechargeable batteries.

This battery tester was chosen from a big array of offers based on reasonable price, size, and ease of use. In fact, it works well in use and is ready to go as soon as you put in batteries. I don't plan to use it a lot but occasionally when trying to decide whether to toss some batteries, or keep them, it will come in handy. This seems capable of testing all the various size batteries (flashlight style and button cells) that we use in this household.

Decent for the price. Can be a bit glitchy. I'll test a battery and get, let's say, 65%. Test again seconds later and get 72% for the same battery. Who knows, maybe I wasn't getting good contact. Overall, it's going to definitely tell you if a battery is good, bad, or if a rechargeable needs topped off. Works well enough that I didn't consider sending it back. I guess that says something.