Button cells · 1.55 V
SR621SWequivalents
The SR621SW is also sold as 364, 363, AG1, LR621 and SR621. They are the same cell under different brand and standard names, so any of them fits.
Same battery, other names
- 364
- 363
- AG1
- LR621
- SR621
Size and specs
- Voltage
- 1.55 V
- Size
- 6.8 × 2.1 mm
- Chemistry
- Silver oxide. AG1 and LR621 are alkaline versions of the same size.
- Capacity
- about 20 to 25 mAh
- Type
- Button cells
SR621SW by brand
Each maker's part number for this size, from the Maxell button battery cross-reference guide. All of them fit the same devices.
| Brand | Low drainSR621SW | High drainSR621W |
|---|---|---|
| Energizer | 364 | – |
| Duracell | D364 | – |
| Rayovac | 364 | – |
| Renata | 364 | – |
| Varta | V364 | – |
| Maxell | SR621SW | SR621W |
| Seiko | SB-AG | – |
| Citizen | 280-34 | 280-70 |
SR621SW vs SR626SW
Batteries people mix up with the SR621SW. Close, but not the same.
| Battery | Size, voltage | Difference |
|---|---|---|
| SR621SW | 6.8 × 2.1 mm1.55 V | This page. |
| SR626SW | 6.8 × 2.6 mm1.55 V | Same width, 2.6 mm thick. Too thick for a 364 slot. |
Good to know
- 364 is the low-drain version for plain analogue watches, and 363 is the high-drain version for watches with a light or alarm.
- Use silver oxide in a watch. An alkaline cell's voltage sags and the watch can lose time.
Questions
What is the equivalent of a 364 watch battery?
The SR621SW is also sold as 364, 363, AG1, LR621 and SR621. They are the same cell under different brand and standard names, so any of them fits.
What size is a 364 watch battery?
6.8 × 2.1 mm, 1.55 V. Silver oxide. AG1 and LR621 are alkaline versions of the same size.
What do Energizer, Duracell, Varta and Renata call the SR621SW?
Energizer: 364. Duracell: D364. Varta: V364. Renata: 364. Other brands are in the table above.
Is a 364 battery the same as an SR621SW?
Yes. 364 is the common name for the SR621SW silver oxide watch cell. The 363 (SR621W) is the same size, made for watches that draw more current.
Battery Inventory for iPhone and iPad
Never look up the SR621SW again.
Battery Inventory remembers which battery every device in your home takes, reminds you when one is due, and counts the spares in your drawer, so you buy the right cell before the old one dies. The finder in the app knows every code on this page. Search any of them, or point the camera at a coin cell to read it.
- Battery change reminders, free
- Monthly smoke and CO alarm test reminders
- A spares drawer and shopping list
- Cordless tool packs and chargers too
No account needed. Smoke and CO alarm features are reminders only: the app can't see or test your alarms.
