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 will definitely be my "Go To" Battery Tester, for all of my household type batteries from now on! It's the one and only one that I've found that actually displays useful information about the state of the battery under test. This tester requires 2 AAA Type batteries ( not included ). I opted to insert Energizer Ultimate Lithium's. With these batteries, the display is crisp, and very easy to read. No back-light in the LCD type display, but who's going to be testing batteries in the dark? Please be advised that the user needs to know that this tester is designed to be "voltage & battery type" specific. The 11 position rotary switch MUST be set to the correct voltage & battery type before performing the battery test. When switched to the appropriate battery V&T, the display capacity indicator sweeps from 100%, to 0% after a slight delay. I'm assuming that this is a sort of boot-up / self test. VERY COOL! At this point, use the spring loaded probes to press against the + (red) and - (black) battery terminals. After a couple of seconds, the display will indicate the battery Voltage, Resistance, and Capacity. If no test is performed within about 1 minute after power-up, the tester will turn itself off. Another outstanding feature of this tester is that it displays the status of the internal battery voltage in the upper right corner of the display (after being turned on). This tester has come in handy for me, because I was able to recover about 5% of a large number of batteries that I had tossed into a box for a future trip to the waste collection folks. Turns out that these 5% were still usable ... indicating 80% or greater capacity, and a good amount of voltage left. The only negative that I can mention about this tester is that the Battery Door was VERY DIFFICULT to open. I had to get a small screw driver, and gently pry on it while sliding it out of position. The "hook" in the center of the battery door is just a bit too high, and doesn't want to release when the door is snapped into place. I corrected this problem on mine by gently sanding the plastic tab down a bit. It releases much easier now. My personal conclusion is that this is an EXCELLENT and QUALITY MADE Battery Tester! Maybe a bit on the expensive side, but would definitely recommend!

First, this meter is designed to test mostly individual cells. It is accurate. It gives a better indicatio of the battery's health than most other testers. The attached test probes are much above average. The spring loaded gold-plated probe tips are pogo-pins with multiple pyramidal tips for excellent contact and consistent readings. The test lead wires are less flexible than I would like. The individual test probes are handy if you store your batteries in organizers that allow access to the battery contacts, but they are otherwise awkward. Good luck testing button cells. Some kind of holder built into the case would be welcome.The manual is difficult to undrestand. This instrument present several indications of a battery's health. It seems to report the open circuit (unloaded) voltage which is what a multimeter would measure. The open circuit voltage alone is not a very good indicator of the battery's state. While alkaline batteries have a gradual decline in voltage with use, other chemistries do not. For example, lithium cells have a very slight decline followed by a precipitous drop. All batteries Have a lower voltage output under load (when they are supplying current). So, the open-cicrcuit voltage may look good, but they won't run your device.. Many testers measure the battery's voltage under somel sort of load to get a better estimate of capacity.. This meter displays the battery resistance, which is the reduction in voltage divided by the change in load current. The resistance becomes higher with use. The meter uses the unloaded voltage, the measured resistance, and assumptions of other factors related to battery type and typical load requirements to estimate the remaining battery capacity. Obviously this can only be a guess of how the battery will perform for you, but it's better than other testers. You need to account for the load's characteristics. For example, does it draw high current? You must use the information from this meter --more than you get from most battery testers--together with your knowledge and experience to decide if you need to discard or charge--if appropiiate-- the battery. On another note, cells that have been in use will often have widely differing meter readings among rhe set. This is not a fault of the instrument. Cells are not made equal; they have slightly different discharge characteristics. Cells in battery packs influence each other as they discharg, resulting in differing discharge rates between individual cells. . Cells that are connected in series can even try to charge the cell that runs out of capacity first, backward! For best results, batteries should always be replaced as a set.

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

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.