Universal Battery Checker Tester with Leads LCD Display, Battery Capacity Voltage Resistance Tester for AAA AA C D 9V Digital 12V 3.7V Li-ion 18650 CR123A CR2032 Button Cell Batteries More

This battery tester works quite well. It accurately tells the battery's power level, not just good, bad, or needs replaced like some testers do. The price isn't bad for the item. It is pretty well built also. It has an electronic display and takes batteries. It tells the % of battery power left from 0 to 100%. It can test about any type of battery.

This is a good battery tester that will test a wide range of batteries. Unlike some common battery testers, you have to use two leads to test the battery, making it awkward especially on smaller batteries.

I got this meter for one big reason, and that was its ability to measure IR in 18650 cells. I didn't want to spend $100 for just that feature, saw this and bought. I've checked the voltmeter on it with 3 other meters I have. One is a $10 meter, another $65 and the last meter, $225. It is consistent and close. The only reason I didn't rate it a 5 was the (perhaps) lack of accuracy.measuring the resistance. A friend that had a 4 wire meter double checked mine and it was off. Doesn't really bother me as I just need a baseline number to compare good vs bad cells, as long as it's consistent, which it seems to be. All in all a good meter for the price, just not sure about the IR measurements.

Bought this to test CR2032 CMOS batteries and it found the weak ones! It does measure the batteries under load (a Pro) but it does not leave the load on (also a Pro). It seems to pulse the load on and off twice before giving the ESR measurement but the voltage displayed is a snapshot of when it was under load (a Pro). This is backed up by the fact that primary lithium batteries (non rechargeable) always give you ~3v when not under load so a multimeter will never be accurate. That is why a tester that puts load on the cell is a must when checking them. I was seeing voltages from 3 to 2.5 to 1.8 to 0.1 and I got rid of any that were under 2.5 around 2.2 to 2.3 or less so I am sure the batteries are going to last a long time in the computer I put them in. Pro's -Auto off feature that almost instantly wakes up, no different than a modern soldering iron (I have a TS-100) -Springy tips for stable contact, one note on those is that the wires are attached directly to the tips so the wires move when the tips move so you dont have to worry about that being an extra variable. -Almost true 4-wire, the cables are thicker than what might be needed is because there are 2 wires inside each. The reason it is almost true 4-wire because the wires connect in the tips not on the contact of the battery (see Con's). -Has a boost converter for low battery stability and accuracy. The internal voltage is higher (5v) than the battery voltage (<3v) so if the battery voltage gets low the output will still be the same until it cuts out completely. Con's -Uses AAA batteries, it could have been greatly improved if it had a rechargeable li-ion battery. It is so close because internally it uses a 5v boost converter to power the internals, so a li-ion battery, protection, charger and usb port would not be hard to implement, I would spend 5$ more if it had that. -Not true 4-wire, as stated in Pro's the 4-wire ends at the tips not continuing onto the battery to be tested, so always test 2 or 3 times to make sure you are making good contact on the terminal and the true reading is the one you get the most. -Rotary power switch, I like toggle buttons so I am not spinning the rotary dial all the way around to turn it off then spinning it all the way back to turn it to the same mode. I am overall pleased with the meter it is great for the price and I think some simple improvements would be great additions in a V2.

Very handy. I checked a whole pile of aa aaa and 18650s, tossed out all the high internal resistance ones. Nice build quality. if you have rechargeables, I highly recommend it.

Great price for peace of mind battery check and well built unit.

Update 091020: After months of using, we're growingly uncertain that this tester is reliably accurate. All partial batteries, that test as high as 85% strong, fail soon after. We thought that maybe it was just the nature of the battery (low drain vs high drain). However, there have been other oddities as well, like how the testers internal battery gauge showed the batteries, that are powering the unit itself, to be completely depleted. After replacing them with new batteries, the old ones when tested externally with the same tester showed one battery to still be better than 50% strong and the other over 70%. I can understand the tester leads being more accurate than the units internal battery monitoring. But 0 to 50/70 is quite the disparity. Original review: This has been great for determining what partial batteries are still good enough to use after only using them briefly in Halloween or Christmas decor, as well as for testing batteries, when trying to figure out why a piece of electronics suddenly stops working properly, when you don't have a spare battery on hand to swap out. As batteries seem to be so wildly priced these days, with some brands costing as much for one as other brands charge for four, we also hoped it might tell us which budget brands are worth the money and which to avoid, as well as which vendors might be selling from an expired lot. There are many cheap testers that just tell you if the battery is good or bad without any relevant details as to how good or bad. This meter offered the promise of MUCH more refined results and works with a larger variety of battery types. It's pretty simple to use, without having to keep a manual handy, which this comes with a very small, brief paper manual for those who still value such, like we do. So far, we're happy with its seeming accuracy, but not exactly confident in it yet, as we've had several batteries, that tested near full, fail surprisingly fast for a near full battery. They were all cheaper generic batteries though. Maybe something about their design makes them drain faster than average in the devices we used them with. Or maybe once a battery starts to drop, it drops at an accelerated rate. The fact that we were using them in a bluetooth remote known to have poor power management, also leaves us skeptical of whether it had anything to do with the accuracy of this tester, which seems pretty precise otherwise. Regardless, it still feels a bit cheaply made - very light-grade plastic. The spring leads (see pictures) are a nice touch, though I've yet to figure out any practical advantage to them for this device, and it makes me wonder if they could compromise accurate conductivity. For the money, I think Dlyfull could/should have included a back-lit readout, as the screen is just too low contrast to easily read in low light. This is the kind of readout you'd expect from something made 10-15 years ago. Ultimately, we're glad we made the investment, as the product as already proved very useful, but in all honesty, ten to fifteen bucks seems a more appropriate price. Had we not had an immediate need, and had I seen it firsthand before buying, we would have held out for a better price.

We use many AA rechargeable batteries, and we need to know how charged they are after sitting. This meter lets us do it fast and cheap. Perfect.

Este aparato logra decirte datos vitales de las pilas. No solo el voltaje y el porcentaje de carga, sino que también la resistencia interna; factor que sirve para determinar el estado real de una pila. Además trae su estuche para protegerlo, un extra que no esperaba recibir, pero estoy satisfecho de que llegara.

does all kind of small batteries , seems well built and works well. A little on the expensive side but if it last and is a top end unit it's worth it. Time will tell. So far happy with it.

The meter is handy, and great for reading the battery condition. However the meter has NO BACKLIGHT on the LCD screen!! I’m not mad about my purchase, but it ticks me off the photo of the instrument has been enhanced. Other then that, I’m good with it.

The display doesn't have light and is hard to read.

Quality of product is admittedly better than usual however the product should not be marketted outside China without proper translation of its product features and usage. Surely with its huge populations and scores of graduates from western universities, Chinese companies can do I better job of writing manuals. For the time being Amazon should clearly state "made in China" to warn its customers before they make such purchases.