La Crosse 911-65557-INT Portable Digital Battery Tester,Black

I volunteer for a non-profit replacing batteries in donated watches. I also use illuminated magnifiers and flashlights to see all those tiny parts (and *find them* when they *launch* themselves across the room. So, batteries of various sizes (D, 9V, AA, AAA plus perhaps fifty sizes of silver oxide, lithium, and alkaline "button batteries) are my daily concern. This seemed to fit my needs best. To use it, simply extend the orange terminal slide out wide enough to let you place the battery against the inside terminal, push the orange slide back in till it touches the other end of the battery and read the voltage and the device's opinion as to whether the battery is dead or on its last legs. This tester is compact, doesn't require a power source, adjusts to fit almost all battery sizes, and is accurate enough to let me know if a battery has enough charge to power the watch I'm working on. It fits into my tool kit, doesn't involve any cables and is more rugged than a traditional voltmeter. And it doesn't cost much. I can't speak to its longevity, but it seems durable enough for my needs.

The last battery tester I purchased was from Radio Shack in the 1980's. After that, for whatever non-logical reason, battery tester functionality relied on power from a battery. This La Crosse portable digital battery tester is the first accurate tester I've found that does not itself require a battery, in addition to which it uses digital technology (not an option in the 1980's) for a more precise measurement. Digital readout is clear. I especially appreciate that this small unit handles such a variety of different batteries, including the CR2032's. Instructions provided are clear (although I used yellow highlighter to indicate what is most relevant for my use). It was well worth the price to finally find something again worth using. The fact that it is so compact makes for easy storage in an office drawer. Thanks La Crosse -

This La Crosse battery tester is an excellent product. It works with a wide variety of voltages and chemistries. I have tried it on alkaline 1.5V (AA, AAA), USB lithium 1.5V (AA), NiMH (AA, AAA), and lithium coin cell 3V (CR2032, etc.) batteries and it appears to give timely and accurate measurements. I love that it is compact so it is easy to store and use on the go. There are a lot of battery testers on Amazon, most of which are Chinese knock offs/generics of a few designs. I appreciate that La Crosse has a unique design with a clear digital readout. You need to know what voltages mean for your particular battery chemistry (1.2V - 1.31V is considered "full" for NiMH batteries, for example), but I much prefer seeing the true voltage readout than generic terms like "good" or "empty". If you are wondering which of the forty different "caliper" or "zigzag" types of battery testers to get on Amazon, don't bother, just get this La Crosse 911-65557-INT one and be happy. The La Crosse 911-65557-INT battery tester is self-powered: powered by the battery that you are testing. There are two points to note about this design. First, if the battery you are testing is truly "dead" (below some critical threshold), nothing will display onscreen because there is no power in the first place. Second, since it is self-powered, the unit itself does not require its own battery so it will always "work" and will not get a corroded battery case because there is no battery case in the first place. If you really need to measure voltage down to the last 0.1V, this product is the wrong product for you. However, if you want to get accurate readings of batteries in various stages, this product is the best one in the price range.

Very convenient battery tester that beats pulling out a multi-meter when I'm trying to sort various used batteries. It's a cool design that doesn't require batteries that is probably better for most people but for me I like to usually know the open-circuit voltage. Tested a C and D size cell against my Fluke 117, and noted about 0.029 to 0.031v (29 to 31 mV) difference when measured open circuit. The tester load itself causes it to drop about 0.005v (5 mV) when I measured the same cell simultaneously with the fluke. This works out to be about 0.16 mW load from the tester itself assuming 150 mOhm internal resistance on the cell. So its accuracy is off by about 25 mV, and the load cause by the tester is 5 mV. Shame that I have to do some math in my head (add about 30 mV), but not terrible. Wish there was a potentiometer inside where I could calibrate the readings myself though.

Great little battery voltage tester! I like that it is small and compact but sturdy and solid build quality and feel. It is much better than other competing testers because instead of just a general red bad, yellow weak or green ok reading it tells you that but it also actually gives you a very accurate digital readout of voltage for example 1.62v on a brand new AAA alkaline battery. I love the versatility as it can test/measure the voltage of many different battery sizes/types AA, AAA, C, D, 9V And button cell batteries as well! Very useful and highly recommended!

Check even the smallest button cell voltage. This is very handy and the cost is reasonable. Had this a week or so, used it to check rechargeable and key fob batteries. This pic is of a very tiny watch battery. Balance it on the neg side (vertical orientation of the unit) and slide the lever closed to check voltage. It worked excellent. So much easier than using a volt/ohm meter. Fun little unit.

This thing is awesome! Handles a ton of different battey types, shows readout clearly and instantly, lets you decide to keep or toss battery, resolves disputes between the battery or the device why no worky. Has no wires. Understands not all batteries are the same so the readout accomodates that and tells you the relative charge level % and the voltage in case you know what volts are. AND it requires no batteries itself!! Electrical Superhero product. Dont just sit there pondering, buy it! Costs less than lunch!

Easy and accurate to use!

Excellent produit. Belle qualité, très compact, facile d’utilisation, grande diversité de piles dont les piles rechargeables, lecture du voltage interne et de l’énergie résiduelle, pile interne non requise pour son fonctionnement. Vaut les quelques dollars de plus.

Perfect for my usage as I use all rechargeable batteries in my home especially for flash photography….doesn’t require any battery or charging for the tester

Practico y sencillo de utilizar. Me ha ayudado a optimizar mi inventario de baterías por su confiabilidad. La calidad es buena.

This is a very simple, versatile and effective tool for testing of batteries at home. Very easy to use and digital display bars really help to know the charge status very effectively. Great and must have tool for this digital age with 10s of batteries lying around at home for so many applications. Very reasonable priced for the quality of the product.

es un producto facil de usar, utiliza la misma energia de la bateria por lo que se puede usar en cualquier momento