Know Exactly Which Batteries Are Dead And Which Are Good With The Battery Tester
Tired Of Guessing Which Batteries In Your Drawer Still Have Power Left?
Stop wasting time swapping batteries in and out of devices trying to find one that works. The Battery Tester delivers instant voltage readings and a five-bar battery level indicator on a clear LCD display the moment a battery is placed in the correct slot, telling you precisely whether it is full, partially used, or ready to be replaced in seconds without any guesswork, trial and error, or dead device frustration.
Looking For A Single Tester That Works With Every Battery Type In Your Home?
Cover your entire battery collection with one compact tool. The Battery Tester handles 1.5V batteries including AA, AAA, C, D, and N cells, 3.7V lithium-ion cells across six common sizes from 10440 to 26650, 9V and 12V batteries for remotes and key fobs, and 1.55V button cells, with a universal spring-loaded sliding contact that adjusts automatically to fit everything from a small N cell all the way up to a large D cell or 26650 lithium pack.
Frustrated By Testers That Require Their Own Battery Just To Work?
Always be ready to test without needing to replace the tester's own power source. The Battery Tester operates without any external power supply whatsoever, drawing only from the battery being tested to power its LCD display and generate an instant reading, making it permanently ready to use straight from a drawer or toolbox without any setup, charging, or battery replacement ever required to keep it operational.
Experience Instant Accurate Battery Testing Across Every Common Battery Type With Battery Tester
Elevate your household battery management with a tester engineered for universal compatibility, instant dual-reading results, and effortless everyday convenience. This compact 33g ABS pocket tester delivers simultaneous voltage and five-bar level readings across 1.5V, 3.7V lithium-ion, 9V, 12V, and button cell batteries through a universal sliding contact and dedicated 9V and 12V port in a slim, lightweight body that fits in any drawer, toolbox, or pocket for immediate testing whenever and wherever it is needed.
Dual Voltage And Level Bar LCD Display
Universal Spring-Loaded Sliding Contact
No External Power Supply Required
DUAL VOLTAGE AND LEVEL BAR DISPLAY
The LCD simultaneously shows the exact numerical voltage reading — such as 1.50V or 3.63V — alongside a five-bar battery level indicator so you get both precise technical data and an immediately intuitive visual status at a single glance, making it easy to assess battery health accurately whether you are a casual household user or a detail-oriented hobbyist or electrician.
UNIVERSAL BATTERY COMPATIBILITY
A spring-loaded metal sliding arm adjusts automatically to accommodate batteries ranging from small 1.5V N cells and AAA batteries through to large D cells and 26650 lithium-ion packs, while a dedicated bottom-edge port handles 9V and 12V 23A batteries used in car key fobs, garage remotes, and doorbells, covering virtually every common battery type found in a typical household or workshop in one single device.
WIDE VOLTAGE MEASURING RANGE
A measuring range spanning 1.5V to 4.8V and 9V to 12V covers the full voltage spectrum of all supported battery types in a single instrument, allowing the Battery Tester to accurately assess everything from standard alkaline household cells and button cells to rechargeable lithium-ion packs without requiring different tools or settings for different battery chemistries.
INSTANT RESULTS WITH NO SETUP
Place a battery into the correct labeled slot with the positive end facing up, slide the spring contact against the negative terminal, and the voltage and level reading appears on the LCD immediately with no warm-up time, no calibration, no mode selection, and no delay, making the Battery Tester the fastest and most effortless way to assess battery health in any home, office, or field environment.
NO EXTERNAL POWER SUPPLY NEEDED
Passive operation means the Battery Tester draws exclusively from the battery being tested to power the display and produce its reading, eliminating the need for an internal battery, USB charging, or any external power source and ensuring the tester is always instantly ready to use directly from storage without any preparation, charging, or maintenance between uses.
COMPACT POCKET-SIZED DURABLE DESIGN
At just 33 grams and measuring 10.5 x 8.2 x 1.42 cm, the Battery Tester slips easily into a pocket, kitchen drawer, toolbox, or camera bag for immediate access wherever battery testing is needed, with a sturdy ABS plastic body that resists everyday wear and handling across years of regular household and professional use without losing accuracy or structural integrity.
Frequently Asked Questions
What should I do if the screen does not light up when I place a battery in?
First confirm that your battery type is on the supported list, as unsupported models cannot be tested. Then check that the positive and negative terminals are correctly oriented and making full contact with the tester. Wipe both the battery terminals and the tester contacts with a dry cloth to remove any oxide build-up, and test with a confirmed new battery to rule out the battery itself being completely dead before contacting customer support.
Why does the tester show full power but the device still will not work?
The Battery Tester displays the no-load open-circuit voltage of a battery, which can appear normal even when the battery can no longer carry a working load. Old or degraded batteries may have sufficient resting voltage but lack the capacity to power a device under actual use conditions. Compare the result against a confirmed new battery of the same type to verify whether the tester is reading correctly and the battery is simply worn out internally.
Can it test the lithium-ion batteries used in flashlights and RC devices?
Yes. The Battery Tester supports six common 3.7V lithium-ion cylindrical cell sizes including 10440, 14500, 16340, 18650, 21700, and 26650, covering the battery types most widely used in high-performance flashlights, RC vehicles, vaping devices, and other portable electronics that use rechargeable lithium cells rather than standard disposable alkaline batteries.
How do I test a 9V or 12V battery with the Battery Tester?
Press the battery's terminals firmly against the dedicated contacts on the bottom edge of the tester, aligning the positive and negative terminals to the corresponding marked contacts. The reading appears on the LCD immediately, giving you the exact voltage and level status of your 9V smoke detector, garage remote, or 12V 23A car key fob battery in the same instant and effortless way as any other supported battery type.
