The short answer is: they're all the same battery. LR44, AG13, and 303 are different names for the identical 1.5-volt button cell, and the label you see mostly depends on the manufacturer or country of origin. This naming confusion frustrates buyers regularly, but understanding why it happens makes it much easier to buy with confidence. When you're shopping for 1.5V non-rechargeable LR44 alkaline button cell batteries for your watch, hearing aid, calculator, or other small device, you can trust any reputable brand selling under any of these three labels, because they're purchasing the same core product.
Why Do These Three Names Exist If They're the Same Battery?
Different battery manufacturers adopted different naming standards based on their regional market or the standards organization they followed. The IEC (International Electrotechnical Commission) uses "LR44" as the standard designation, while some manufacturers and retailers label the same battery as "AG13" (typically used in older European standards) or "303" (an older military designation). Think of it like how a single type of car tire might be called by different brand names depending on the manufacturer, but the tire specs remain identical.
The frustration intensifies when you find all three labels on Amazon, local drugstores, and electronics retailers, often on visually identical silver button cells. Your instinct to double-check is smart, but once you understand the labeling issue, the choice becomes much simpler. We covered this in more detail in our guide on Which AG13 Battery Pack Offers the Best Price Per Battery in 2025?, which explains how to spot the real differences between packs even when the batteries themselves are interchangeable.
How to Verify You're Getting the Right Battery
The safest way to confirm compatibility is to check your device's manual or the battery compartment itself. Most watches, clocks, hearing aids, and small electronics either print the required battery type inside the compartment or list it in the documentation. If your device says "LR44," you can confidently purchase AG13 or 303 batteries without hesitation. Voltage is the critical spec: all three names designate a 1.5-volt alkaline battery, which is what matters to your device's function.
Size is another quick verification point. These button cells are all approximately 11.6 millimeters in diameter and 5.4 millimeters thick, so if you're comparing physical dimensions to your old battery, you'll find they're identical across all three label types. The 1.5V non-rechargeable LR44 alkaline button cell you order will fit the same compartment as an AG13 or 303 would, assuming your device originally used one of those older label names.
What Actually Matters When Buying
Rather than getting caught up in label confusion, focus on three practical factors: the brand's reputation for quality and shelf life, the cost per battery when buying in bulk, and whether the seller offers reliable customer reviews. A trusted manufacturer like AmVolt, Duracell, or Energizer will deliver consistent voltage and hold their charge well, regardless of whether you're buying under the LR44, AG13, or 303 label.
Buying in bulk makes financial sense because these batteries remain fresh for years when stored properly in a cool, dry place. A 15-pack ensures you have replacements on hand for multiple devices, and the per-unit cost drops significantly compared to buying individual batteries from a pharmacy or convenience store. The label confusion sometimes works in your favor, because sellers offering the exact same battery under different names compete on price, making it easier to find a genuine bargain.
The Bottom Line for Your Purchase
Trust the 1.5-volt specification and the diameter and thickness measurements more than the label name. If you need an LR44 battery, feel confident purchasing AG13 or 303 batteries from a reputable seller, because they're the same product with different names. This clarity removes a major source of buying anxiety and opens up your options to whichever pack offers the best value and availability at the moment you need it.
The 1.5V non-rechargeable LR44 alkaline button cell batteries you choose will power your watch, calculator, hearing aid, or small electronic device just as reliably whether the packaging says LR44, AG13, or 303. Once you've verified the voltage and size match your device's needs, the decision becomes straightforward. Buy from a trusted brand, compare the per-battery cost across bulk options, and you'll feel confident you've made the right choice.