Cotchear 50pcs Alkaline Cell Batteries Assorted 1.5 Volt AG1/LR621 AG3/LR41 AG4/LR626 AG10/LR1130 AG12/LR43 AG13/LR44 Coin Batteries Set 0% Mercury

Keeping a few coin cells in a drawer used to mean gambling that I’d have the right size when a watch or kitchen timer died. I picked up the Cotchear 50‑pack coin cell assortment to see if one compact kit could cover most of my household needs without running to the store for every battery swap. After a stretch of everyday use and a bit of bench testing, I’ve got a solid feel for where this assortment shines—and where it doesn’t.

What’s in the pack

This is a 1.5 V alkaline assortment, not a mix, and not the 3 V lithium “CR” style cells. You get six common alkaline sizes:

• 10 × AG1 (LR621; commonly cross‑referenced as 364)
• 10 × AG3 (LR41; 392)
• 5 × AG4 (LR626; 377)
• 10 × AG10 (LR1130)
• 5 × AG12 (LR43; 386)
• 10 × AG13 (LR44; 357)

Those cross‑reference numbers are the silver‑oxide equivalents you often see on watch case backs. The fit is the same, but the chemistry is different—more on that below.

My kit arrived in perforated blister strips with each cell labeled by size. The labeling is clear, and the mix covers most of the small gadgets I encounter: quartz watches, digital thermometers, small laser pointers, pocket calculators, and a handful of novelty LED gadgets.

Build, safety, and packaging

Cotchear advertises mercury‑, lead‑, and cadmium‑free construction and uses a cold‑rolled iron casing for improved sealing. The cells I inspected were cleanly crimped with even seams and legible markings. I like that there are no loose bulk sleeves; each battery takes a deliberate push to remove from its blister, which helps reduce accidental shorts rolling around a junk drawer.

Open‑circuit voltage on a random sample of 12 cells (two from each size) measured between 1.58 V and 1.62 V out of the package, which is exactly what I expect from fresh alkaline button cells. Date and lot codes were present. Cotchear claims improved leak resistance; I can’t validate that long‑term yet, but I had no leakage in devices over the test period.

One caution from my lot: I noticed two cells with faint oxidation on the rim out of the blister. They still read proper voltage, but I didn’t install them. It’s not unheard of with budget coin cells, and it’s a good reminder to give each cell a quick visual check before use and store the kit somewhere truly dry.

Real‑world performance

I installed cells across a few everyday devices:

• Watch (AG4/LR626): The quartz watch started instantly and, after several weeks, shows no time drift beyond the watch’s typical quirks. Alkaline cells sag voltage more than silver‑oxide equivalents as they age, so I expect a shorter service life than a “377” silver‑oxide battery in the same watch, but for a fashion watch I wear occasionally, the trade‑off is fine.

• Digital thermometer (AG3/LR41): Instant boot, readings consistent with a calibrated reference thermometer. These low‑drain, intermittent‑use devices are a good match for alkaline coin cells.

• Pocket calculator (AG10/LR1130): Stable contrast and no dimming after sporadic use over a few weeks. Calculators sip current; I don’t foresee issues here.

• Laser pointer and a novelty LED keychain (AG13/LR44): Brightness was consistent across short sessions. Alkaline coin cells don’t love sustained high‑drain use, and you’ll notice brightness taper off sooner than with fresh lithium primaries or multiple stacked cells, but for quick use they’re perfectly serviceable.

• Kitchen timer (AG13/LR44): No issues; the beeper remained loud and the screen crisp.

It’s important to set expectations by chemistry. Silver‑oxide cells (those “357/377/392/364/386” equivalents) offer a flatter discharge curve and typically longer life in watches and precision devices. Alkaline equivalents are less expensive and work well in many cases, but they’ll drop voltage more gradually as they age. That can affect timekeeping accuracy or LCD contrast near end of life. If a watch is finicky about voltage or you want maximum interval between changes, silver‑oxide still wins. For thermometers, remotes, simple toys, and calculators, these alkalines are a practical, cost‑effective choice.

Compatibility notes

A few quick clarifications that will save you returns or frustration:

• These are alkaline 1.5 V “LR/AG” cells, not 3 V lithium “CR” cells. They won’t replace CR2032, CR2025, or CR2016. If your device calls for a CR‑type battery, this kit won’t help.

• The cross‑reference numbers printed on watch backs (357, 377, 392, etc.) usually point to silver‑oxide cells. These Cotchear cells are the alkaline counterparts; they’ll fit and work in many watches, but runtime and voltage stability differ.

• Hearing aids typically use zinc‑air cells (e.g., 312, 13, 10). Those are not included.

• Some devices stack multiple coin cells in a barrel or tray. Match the size and count, and avoid mixing old and new cells.

Handling and storage

Basic but important advice:

• Keep them in a cool, dry place; humidity is the enemy of coin cells.
• Don’t peel the protective blister until you’re ready to use a cell.
• Label the back of the blister card with the purchase date; it helps you rotate stock.
• Never attempt to recharge alkaline coin cells.
• Coin cells are a swallowing hazard. Store out of reach of children and pets, and use devices with screw‑secured battery doors when possible. Recycle promptly after removal.

Value and use case

The main appeal here is breadth and convenience. The per‑cell cost is low, and the assortment means I’m likely to have a correct fit for most small devices around the house. For tinkerers and anyone who services a mix of gadgets—fixing watches for friends, bringing old calculators back to life, swapping cells in kitchen timers—this is exactly the kind of set that earns its space in a toolbox.

If your needs are narrow and you only ever replace, say, LR44 in a single device, a single‑size multi‑pack from a name brand might make more sense. Likewise, if you’re particular about watch accuracy and battery lifecycle, I’d budget for silver‑oxide cells in the specific size you need. For everything else, this assortment is pragmatic.

Environmental claims and end‑of‑life

Mercury‑free is standard now, but it’s still worth calling out. These are also free of lead and cadmium. That doesn’t make them trash‑can friendly—aluminum foil tape over both sides, then take them to a battery recycling drop‑off. Many hardware stores and municipal centers accept button cells. Keeping them out of the waste stream is the right move.

Pros and cons

Pros:
- Wide coverage across six popular 1.5 V sizes
- Clear labeling and easy‑to‑store blister packaging
- Consistent out‑of‑package voltages in my samples
- Mercury‑, lead‑, and cadmium‑free
- Excellent per‑cell value for general‑purpose use

Cons:
- Alkaline chemistry means shorter, less stable runtime than silver‑oxide in watches
- Not a replacement for 3 V lithium “CR” sizes
- I encountered a couple of cells with light rim oxidation; worth inspecting before use

The bottom line

The Cotchear assortment does exactly what I hoped: it reduces the friction of keeping small devices running. As a general‑purpose stash, it’s been handy, predictable, and inexpensive to feed the small electronics that pepper modern life. I wouldn’t pick it as my go‑to for a high‑end watch where I want a long, flat discharge profile—that’s still a job for silver‑oxide—but for thermometers, timers, laser pointers, calculators, novelty LEDs, and everyday fashion watches, these alkaline cells have been up to the task.

Recommendation: I recommend this 50‑pack for households and hobbyists who want a ready supply of common 1.5 V coin cells at a low per‑cell cost. It’s a practical, space‑efficient way to cover a lot of small devices. If you’re buying specifically for watches where accuracy and maximum lifespan matter, consider silver‑oxide versions of the exact size you need instead; for almost everything else, this assortment is a smart add to the drawer.