Dlyfull Battery Tester, LCD Display Universal Battery Checker for 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 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.

This tester is so easy to use. You just locate the terminal for the battery type you want to test, place the battery with the "positive side down" and touch the wire to the negative end. The display shows a brief "countdown" image and the reading is then displayed. It's a great unit for a reasonable price.

Seems to be working ok. The instruction booklet could be more helpful. I was confused at first because the display does not show anything, there is no on/off switch. There is 1 button I had thought would serve that purpose but it does not, it turns on the display very briefly and then shuts down. Ignore the button and just put the battery positive on charger and use the tester stick on the negative, then the display will show.

It is an excellent item at a great price, well packed, and delivered promptly with no issues. The seller is an A+++ on Amazon!

This only gives you a consistent reading on alkaline batteries. I bought this primarily for testing Ni-MH and Ni-CD batteries and it’s completely useless with those. Test the same fully charged battery 5 times in a row in one minute and you will get wildly different results (85%, 15%, 50%, 70% and 10%). If you’re not getting this for alkaline batteries don’t waste your money. I missed the return window or this would’ve gone back as it’s useless to me.