The short answer: they're all the same battery. LR44, AG13, 303, and 357 are different labeling systems for an identical 1.5-volt button cell battery used in watches, calculators, hearing aids, and small electronic devices. Different manufacturers and regions simply use different naming conventions for the exact same product. When you're shopping for replacement batteries, any of these labels will work in your device as long as the voltage matches. If you're looking for a reliable, affordable 15-pack to keep on hand, you can check current price on Amazon for AmVolt's premium alkaline option.
Why Do These Batteries Have So Many Names?
The confusion happens because button batteries don't have a universal naming standard across the industry. LR44 is the International Electrotechnical Commission (IEC) designation. AG13 is used primarily by watch and jewelry manufacturers. SR44 and 357 come from alternative labeling systems used in different regions and product categories. Think of it like how a T-shirt might be labeled as "small," "S," or "size 2" depending on the retailer, but they're all the same garment.
Manufacturers often use whichever label makes sense for their market. A hearing aid company might print AG13 on their recommended battery list, while a toy manufacturer lists 357. A watch instruction manual might say LR44. The battery inside the packaging is chemically identical across all these labels.
How to Know Which Label Your Device Needs
Check your device's manual or the battery compartment itself. Most devices print the required battery type right on the back cover or inside the compartment door. If you see any of these four labels, you're safe to use any compatible 1.5-volt alkaline button cell. Don't worry about which specific label appears on the packaging you buy.
The only real thing to verify is the voltage. These batteries come in 1.5-volt alkaline versions (the most common type) and also in silver oxide versions that last longer but cost more. For typical household devices like clocks and calculators, the standard 1.5-volt alkaline is perfect. If your device requires a silver oxide battery, the label will usually specify that or recommend it for watches.
What Makes a Good Choice When Buying Button Batteries
Since the label doesn't matter, focus on what actually does: brand reliability, shelf life, and price per battery. Premium brands like AmVolt manufacture to high quality standards, which means consistent voltage output and longer shelf life. Cheaper generic batteries might work, but they can die faster or fail to deliver full power. When you check current price on Amazon for a 15-pack, you're locking in a much lower per-battery cost than buying individual batteries at pharmacies or convenience stores.
We covered this in more detail in our guide on LR44 vs 303 Battery: Are These Button Cell Labels Truly Interchangeable?, which walks through the chemistry and compatibility in depth if you want to go deeper.
The Real Benefit of Buying in Bulk
Most households have multiple devices that use these tiny batteries. A wristwatch, a calculator, a wall thermostat, reading glasses with LED lights, remote controls, hearing aids, and kids' toys all use the same 1.5-volt cell. Buying a 15-pack means you're covered for years and won't waste money on premium convenience store pricing when a battery dies unexpectedly.
Alkaline batteries have a shelf life of five to seven years when stored in cool, dry conditions, so stocking up doesn't mean waste. You'll simply use them as devices need replacement, and the per-battery cost is dramatically lower than buying singles.
Bottom Line: Buy With Confidence
Stop worrying about whether LR44, AG13, 303, or 357 is the "right" label. They're the same battery, just with different names stamped on the packaging. Your device doesn't care which label is printed on the outside. What matters is buying a quality 1.5-volt alkaline battery at a fair price, and a multi-pack saves you money and hassle. Whether you're replacing a dead watch battery or stocking up for household emergencies, a reliable 15-pack handles it all.