This tester will test batteries under load which is more accurate. I have 3 swing needle type testers which just test the voltage with no load and they all said some dead batteries were good. This tester indicated correctly that the batteries are dead. After lots of testing - I trust this one. Delkin Devices DD/BATTEST MULTI RoHS AA/AAA Battery Power Tester
I work in the Video Production industry and go through hundreds of batteries a month so I need a battery tester that I can rely on (or it's my job on the line!). This little tester gives you everything you'll ever need in the field or at home (I have one for each). Tests 9-Volt, AA and AAA batteries quickly, giving you a reading in about 3 seconds. I've been using it daily for 4 years now without problems. This tester measures the batteries under load (unlike similar needle testers) so it provides an appropriate measurement of remaining battery life. It is compact (tests AA and AAA batteries in the same tray) and easy to use (unlike the awkward hinged needle testers). The tester has a convenient switch for testing rechargeable batteries or primary (non-rechargeable) batteries. The tester is powered by the battery you're testing, which is actually a blessing in disguise. If you've got a battery to test with even the slightest of charge left, it will still work accurately.
Downside: AA batteries sometimes need to be held in place or they pop out of the tester. It's easy enough to leave a finger on the battery when testing, but you shouldn't have to do that.
Here are a couple tips for use from my experience:
1: Very important!! When you insert a battery into the tester, all of the green indication LEDs illuminate for about 1/2 second then turn off. This ONLY indicates you've inserted the battery properly and shouldn't be misread as an indication of battery level! Wait until the indication LEDs turn back on and remain lit (this is your true battery power indication).
2: When the LEDs don't illuminate after inserting a battery, there's a good chance you didn't insert the battery properly. Even a battery that doesn't have enough juice to turn the hands of an analog clock will power the tester enough for a reading. Simply remove the battery and try again (be sure you've matched the polarity of the battery to the polarity of the charger (+ to +, - to -). If still no reading, the battery is most likely completely discharged (this happens when you leave a device in the ON position for days/weeks [like a flashlight]). To confirm, simply test a different battery (one that has at least some charge). This will also confirm the tester is working properly.
3: When testing 9-Volt batteries (rectangular batteries), be sure the polarity is correct. The smaller round contact on the 9-Volt is the positive (+). The wider, frayed contact is the negative (-).
I use many NiMH rechargeable batteries - most are identical in appearance... They eventually wear out - but it's hard to tell which are holding less of a charge than others... and some devices (like a wireless mouse) will operate fine on the lower voltage batteries...
This device easily lets me sort them...
This is without doubt one of the best purchases i have ever made. Until I received this item had no idea how many weak even dead batteries occupied space in my home.In minutes you go thru all the batteries in remotes, drawers etc. I have loaned it to neighbors and friends. Simply Superlative
As stated in other reviews, Delkin Aa/aaa Battery Tester is a "load" tester which gives much better readings than non-load testers. I also have the more expensive the ZTS Mini Multi-Battery Tester and both testers are pretty much in sync with battery readings 90% of the time with the ZTS occasionally reading one bar higher. I have a bit more confidence using both testers.
After going through the almost 40 supposedly "dead" batteries my kids have accumulated, I found about 12 with still 80% life; another 9 with 40-60% life; and another 5 or so with still 20% life which will work fine in TV remotes. So these testers will pay for themselves in no time and in the long run save me money.
This is definitely one of the better battery testers, but why did they not include the ability to test "C" and "D" cells? That's a big omission in my book.
I'm an electronic technician by trade and would have preferred to see a display of the actual battery voltage along with the LED indicators. Some devices don't work well with even a slight reduction in battery voltage, and this added feature would be helpful in those situations.
This has been a great battery tester. The display shows 5 lights, so 5 lights is 100% charge, 4 lights is 80% charge, 3 lights is 60% charge, etc. It will test AA, AAA, 9 volt, CR-V3, and 2CRS batteries. The tester itself does not have an internal battery that has to be replaced--it uses the power of the battery that is being tested. Unfortunately it will not test C and D batteries. It does have a switch for testing conventional batteries vs rechargeable batteries. One of the best features is that it tests batteries under a load, as opposed to many of the more inexpensive battery testers that do not test under load.
So the Delkin battery tester is really good when you have some batteries laying around the house and you don't know whether to trust them or throw them out. Or if some device is not functioning as it should, you can easily check the batteries. I really like the ability to switch to the rechargeable mode and check my rechargeable batteries. After I have charged my rechargeable batteries I can tell if they are fully recharged or maybe only have 80% charge or 60% of a full charge. Or if it's been some time since I've recharged the batteries, I can quickly test whether they have retained their charge. So it's helpful to know when it's time to replace my rechargeable batteries because they won't fully charge any longer. - 9v - Aa - Battery - Aaa'
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