La Crosse Digital Battery Tester

Design and Build Quality

There are a lot of battery testers on Amazon. Most of them are generic designs from the same few factories, relabelled under different brand names. The La Crosse stands out because it has a genuinely unique design with a clean digital readout and a build quality noticeably above the cheap caliper-style testers that dominate the listings. If you've been scrolling through pages of identical "zigzag" style testers trying to pick one — skip it and just get this.

At 8.98cm / 3.54 inches it fits easily in any tool kit or drawer.

How It Works

Using it is genuinely simple. Slide the orange terminal out wide enough to fit your battery, place the battery against the inner contact, push the orange slide back in until it presses against the other end of the battery, and read the display. The whole process takes about three seconds. There's no button to press — contact completes the circuit automatically and the reading appears.

The digital display shows the actual voltage, which is more useful than the vague "good / okay / replace" indicators on cheaper testers. If you're testing NiMH batteries, for example, 1.2V–1.31V is considered full — knowing the real number lets you make an informed decision rather than guessing from a colour bar.

Battery Size Coverage

The sliding design handles an impressive range: AA, AAA, C, D, 9V, and a large variety of button batteries including silver oxide, lithium, and alkaline coin cells. That last category is where a lot of testers fall short — button batteries are fiddly to test with clamp-style testers, but the La Crosse handles them cleanly.

Handles button cells cleanly — a weak point for most competing testers.

Accuracy

It's accurate enough for practical use, with one caveat worth knowing. Testing against a calibrated Fluke 117 multimeter, the La Crosse reads about 25–30mV below the true open-circuit voltage. That's a small but consistent offset — if you need precise voltage measurements, just add about 30mV to whatever it displays. For the vast majority of use cases — checking if a battery is worth keeping or throwing away — this level of accuracy is completely fine.

Build Quality & Portability

It feels solid. The orange sliding mechanism moves smoothly and holds position — batteries don't slip out mid-reading the way they can with cheaper spring-loaded testers. At 3.54 inches it's small enough to live in a tool kit, gig bag, or kitchen drawer without taking up meaningful space. It's the kind of thing you buy once and forget about until you need it, and when you do need it, it just works.

What It's Missing

No complaints about what it does — just a few things it doesn't do. There's no way to calibrate it yourself, so that consistent 25–30mV offset is something you have to account for mentally. It doesn't test rechargeable lithium-ion cells (laptop batteries, phone batteries, 18650s). And it only comes in black.

Who Should Buy This?

Anyone who goes through batteries regularly and is tired of guessing. Households with kids and remotes and toys. Anyone who does watch repair, photography, or any hobby involving small electronics. At $15.99 the question isn't really whether it's worth it. It is. The question is why you don't already have one.