168MAX Battery Tester,Suitable for AA AAA C D 9V 1.5V Button Cell Batteries，Portable Universal Digital Battery Charge Checker,Black

The unit itself is a little awkward to hold a battery in, but not a huge deal. I tested about 40 batteries that were in various stages of used with a meeter that has a red, yellow, green arm and didn't really feel i could judge how strong the batteries are. with this digital read out, i feel it is more accurate and even if not, truly tells me which ones are stronger, with are in the medium range, etc. It at least allows me to categorize them as compared to the other ones in different ranges. The red, yellow, green arm did not. I use brand new batteries in my electronic door locks on outside of my house, but you have to replace them at 50%, therefore i keep them, test them, and use them in other devices after i take them out of the locks. I then use the used batteries depending on strength in devices that may or may not need as strong of a battery.

I use a lot of rechargeable batteries and rechargeable batteries wear out. I have an analog battery tester and thought a digital tester would be more accurate. The analog meter has colored bands that indicates the battery charge. The digital meter has no indication if the battery voltage displayed is good or bad. So you have to make a note of what the fully charged battery value is. Also make note of what voltage a discharged battery is. So a double A 1.5v battery fully charged is between 1.38v to 1.44v for full charge. The voltage value between battery sizes also differs and you have to record what the full charge is for each battery size. I guess the accuracy of the digital meter is better than the analog but you have to record the voltage value. The analog meter is easier to use even though digital is more accurate.

difficult to use some times. good for large but not small or flat type battery

Here we have yet another cheap Chinese product, with no documentation and someone else claiming to be the manufacturer. Still a neat little gadget, but it's a crap shoot as to how long it will function.That's why you see many reviews on Amazon that either say a product is great or it's crap.It's a matter of which unit you get as to whether it will do it's job or fail just after the return window.RETURN anything that fails!!If you are outside the return window, contact the seller and explain your situation.Some sellers will send you another unit or refund. If you don't try, you will never know.I made up a nice-looking little chart with specs that apply to virtually any tester of home batteries.Have a good day!!

I have lots of NiMH-powered devices around the house, and I measure all cells every time I replace them with fresh ones.This device helps assess cell state of charge very quickly, without having to use an actual multimeter. I found it to be quite accurate, reading within 1 least significant digit of actual voltage (tested with an adjustable power supply).The device is powered from the cell under test, so it requires a certain minimum voltage to run. I found that the lowest it'll go is 0.47 V, and obviously it won't work for reverse-charged cells. Bottom line: this is a super helpful gadget that speeds up most of your measurements, then you can use an actual multimeter to check any odd cells that are below 0.5 V.

I absolutely loved this product for a few days, then I noticed it was no longer working.I purchased it and used it almost daily, given it was near Christmas, and I was constantly testing batteries to use for decorations.A few days later it gave no reading (the screen remained blank) for a pair of batteries that I thought still had juice. Didn't think anything of it, tossed the batteries in the trash and used a pair of freshly recharged batteries instead.Later that day, same thing - I went to test a pair that I knew still had some life in them (enough for a small LED extension, at the very least), but the tester gave no reading. I tried a brand new battery and got no reading. I tested a pair of recently charged rechargeable batteries and, as before, screen didn't turn on - no reading at all.I removed the back plate, everything was soldered in place. I removed the 9v (square) battery from a voltmeter and tested it and it worked. The device had lost ability to read anything via the arm (A, AA, AAA, C, D) and would only read through the side terminals.I am currently in the process of returning it.

I liked the size, it's functionality, & price. The 1 thing I didn't like about it is I didn't buy 2 when I bought the 1st one.

Often the display is much less readable than this photo, like blank unless you angled it just right.Why is a screwdriver included? It's nice but there's nothing apparently user serviceable inside.The battery contacts could have been designed better.