Finding the right watch battery replacement is simple once you know what to look for. Most watches use either a silver oxide (SR) or alkaline (LR) cell, identified by a code printed on the battery itself, such as SR626SW, LR44, or AG4. Check your watch’s existing battery or the manufacturer’s manual for the correct code, then match it to the right replacement.
We stock a wide range of watch batteries in NZ across all common SR, LR, and AG sizes, with fast NZ-wide delivery. Not sure which battery you need? Contact us and our team can help you identify the right size.
NOTE: Products listed in this section are watch batteries. For the full range of button and coin cell batteries including key fob, calculator, and medical device sizes, see our Button Cell Batteries range.
Watch Battery Types & What They Mean
Watch batteries come in three main types. Here’s how they differ and which is best for your watch:
| Prefix | Chemistry | Characteristics | Best For | Example Codes |
|---|---|---|---|---|
| SR | Silver Oxide | Flat, stable voltage throughout life. Longer lasting than alkaline in watches. | Analogue and digital watches requiring precision and longevity | SR626SW, SR44SW, SR920SW |
| LR | Alkaline | Lower upfront cost, but voltage drops faster toward end of life. | Kids’ watches, lower-cost timepieces, short-term use | LR44, LR41, LR1130 |
| AG | Alkaline (cross-reference) | AG codes are common equivalency references for LR (and sometimes SR) sizes. | Any device using AG-coded batteries — match to the equivalent SR or LR | AG4 (=LR66/SR626), AG13 (=LR44/SR44) |
Silver oxide (SR) batteries are the preferred choice for most watches due to their stable voltage output, which keeps timekeeping accurate right through to the end of battery life. Alkaline cells can cause watches to lose time as the voltage drops.
Common Watch Battery Sizes & Uses
Button cells are used across a wide range of everyday devices. Here’s a quick guide to help you find the right match:
| SR626SW (377 / AG4) | SR621SW (364 / AG1) | SR920SW (371 / AG6) | SR44SW (357 / AG13) | SR1130SW (390 / AG10) | AG4 / AG13 equivalents |
|---|---|---|---|---|---|
| One of the most common watch batteries. Used in a wide range of analogue watches from brands including Seiko, Citizen, and Casio. | A smaller cell used in slim women’s watches and compact timepieces requiring a thinner profile. | A larger silver oxide cell used in many full-size analogue and dress watches. | A high-capacity cell used in larger watches, some digital watches, and small electronic devices. | Widely used in mid-size watches and electronic devices. Often interchangeable with LR1130. | AG codes are cross-references. AG4 = SR626SW / LR66; AG13 = SR44 / LR44. If your battery shows an AG code, match it to the equivalent SR for best performance. |
Not sure which size fits your watch?
Check the back of your current battery. The code is printed directly on the cell. If the battery is unreadable, your watch manufacturer’s website or owner’s manual will list the correct size.
