A REAL under load Alkaline/NiMH/Lion battery tester.
Posted: Fri May 01, 2020 12:04 pm
I recycle batteries, and I always test them even if the device is acting like they're dead, because sometimes it's not the battery and just some corrosion.
We have a lot of electronics and use a lot of batteries, and I buy them by the brick at Sams.
I also stock batteries for hurricanes, and I check them every year to make sure they're still good. Especially "D" cells which I stock pile for LED lanterns.
For many years I used a simple and cheap small Radio Shack battery tester that did the job well enough. It put a slight load (via a resistor) on the battery to try to give a fairly accurate measurement under load, since a weak battery under no load (like if you just test it with a VOM) can show you nearly full voltage even though it's weak under load.
Well that Radio Shack tester finally broke, and since then I bought a couple of look-a-likes on Amazon that don't work worth squat. They often show dead batteries to be in the green. I'm assuming they aren't putting a load on the battery, or not much of one.
Since I do test a lot of batteries I decided to invest in a good one that didn't break the bank. I did a lot of research and review reading and bought the ZTS – Mini Multi-Battery Load Tester at Amazon for $45 (they have a more expensive version with more battery options, but this is all I needed).
Seems to work very well. I have a bag of dead batteries (waiting to be taken to the recycling center), that I know are dead, and some used batteries that based on their usage and VOM reading under load seemed to me to be still good, and this tester confirmed that (out of 6 suspected good batteries, 4 showed as 100% (this tester has only 5 bars: 20,40, 60, 80 and 100% so I suspect the 100% batteries were closer to 90%), and the other two shows 80% (good enough to throw in a remote control and finish using them up). All the ones in the bag I knew were dead read were anywhere from nothing to 60%.
It's a fully electronic device, not just taking a meter measurement. It takes a few seconds to measure the battery, during which the lights scan back and forth, and then it shows the result.
We have a lot of electronics and use a lot of batteries, and I buy them by the brick at Sams.
I also stock batteries for hurricanes, and I check them every year to make sure they're still good. Especially "D" cells which I stock pile for LED lanterns.
For many years I used a simple and cheap small Radio Shack battery tester that did the job well enough. It put a slight load (via a resistor) on the battery to try to give a fairly accurate measurement under load, since a weak battery under no load (like if you just test it with a VOM) can show you nearly full voltage even though it's weak under load.
Well that Radio Shack tester finally broke, and since then I bought a couple of look-a-likes on Amazon that don't work worth squat. They often show dead batteries to be in the green. I'm assuming they aren't putting a load on the battery, or not much of one.
Since I do test a lot of batteries I decided to invest in a good one that didn't break the bank. I did a lot of research and review reading and bought the ZTS – Mini Multi-Battery Load Tester at Amazon for $45 (they have a more expensive version with more battery options, but this is all I needed).
Seems to work very well. I have a bag of dead batteries (waiting to be taken to the recycling center), that I know are dead, and some used batteries that based on their usage and VOM reading under load seemed to me to be still good, and this tester confirmed that (out of 6 suspected good batteries, 4 showed as 100% (this tester has only 5 bars: 20,40, 60, 80 and 100% so I suspect the 100% batteries were closer to 90%), and the other two shows 80% (good enough to throw in a remote control and finish using them up). All the ones in the bag I knew were dead read were anywhere from nothing to 60%.
It's a fully electronic device, not just taking a meter measurement. It takes a few seconds to measure the battery, during which the lights scan back and forth, and then it shows the result.