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Most Helpful Customer Reviews
94 of 94 found the following review helpful:
 Useful product at reasonable priceJan 24, 2008
By Ronald Allen
Very handy. Works on all popular battery sizes. Great way to determine strength of batteries that have been lying around the house for a long time. I have also tested batteries that I use in devices that take multiple batteries and can quickly determine if one or all of them need to be replaced. There are similar products on the market that likely work as well. This was one of the least expensive, is easy to use, seems durable and does the job.
105 of 108 found the following review helpful:
rechargeable batteries produce lower votage . . .Sep 03, 2009
By trebe
This review is for the SE BT20 battery tester, which is a good, low cost, easy to use tester, that provides basic information about the condition of a battery. The tester has three ranges, `Good' (green), Low (yellow), and `Replace' (red). The sliding red contact is adjusted manually.
The tester is designed to work with various types of 1.5 volt batteries (AAA, AA, C, D, disc or button type). Do not try testing a battery of a higher voltage, as you may fry a resistor, blow a fuse, or otherwise damage the tester. There is a separate set of contacts for testing 9 volt batteries.
To precisely measure a battery's actual output, a voltmeter would be used. A tester like the BT20 only provides a rough idea of battery strength. A new 1.5 volt, non-rechargeable battery, delivering the full 1.5 volts, should read at the top end of the green scale. Rechargeable batteries (AA, AAA, C and D size) are designed to produce only 1.2 volts at full output. Because this is 80 percent of the 1.5 volt maximum the tester is rated for, a NiMH battery will normally read somewhere in the middle of the green section. This may lead some to believe that the battery is `weak', when it is actually at its full rated power. While a lower reading is normal for a NiMH battery, a 1.5 volt non-rechargeable battery with the same reading, is actually down about 20 percent from full voltage, and may not have that much useful life left. Rechargeable 9 volt batteries are rated at only 7.2 volts, and would similarly produce lower readings, even at full power.
If you want a basic tester for 1.5 volt batteries, this is a good choice. If you need more precision, look at a voltmeter or multimeter.
57 of 58 found the following review helpful:
Does exactly what you want a battery tester to do!Dec 29, 2008
By Mark Fitzpatrick
"Math Teacher"
This inexpensive device ships FREE! It does exactly what you want a battery tester to do - tell you if a battery is good or bad. No need to interpret a multimeter or fiddle with electrodes. The needle bounces to "good" or "replace." Easy. I don't know what these people need rubber bands for (other reviews). It takes one second to make contact with the battery and read the meter. There is no need to hold it in for more than a split second. You just push the slider to the battery with your thumb and your done. Easy, cheep, and accurate.
19 of 20 found the following review helpful:
 Very BasicJul 14, 2009
By Bungholio
I put a battery in that didn't have enough juice to power a clock and it still read in the green. I'm not sure I can trust the reading on this device.
13 of 13 found the following review helpful:
No more guessing if the batteries are deadJan 30, 2009
By Karen Weiss
I'm rarely inspired to write a review, but this inexpensive little piece of plastic has improved the quality of my life. No more swapping out batteries with working flashlights or Wii controllers or whatnot to see if they're truly dead. And I've developed a nice green system around it: all batteries that flunk the test are put into a bag that periodically gets emptied at a battery recycling collection spot.
One more thing... FindingKing promised a fast delivery date and the package arrived even sooner than that. And shipping was free. Well done!
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based on 237 reviews
