is there an expiration date on them?

There is a "Use by" date stamped on the package. I bought mine about three months ago. My package says "Use by 07/2022".

Is the sr626sw the same at the 377 sr626sw?

The 377 and SR626SW are the same battery. The only difference may be the battery drain.

I need a 390 battery can I use another size?

why watch has 377 battery because that what it was design for

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⏱️ Power your moments with Maxell’s precision pulse!

LEAK PROOF CONFIDENCE - Maxell’s proprietary leak-proof tech protects your valuable devices from electrolyte damage.
DUAL DRAIN PERFORMANCE - Choose low drain for classic analog or high drain for smart watches with alarms and lights.
UNWAVERING VOLTAGE STABILITY - Flat discharge curve ensures consistent power until fully drained, no surprises.
TRUSTED JAPANESE CRAFTSMANSHIP - Manufactured in Japan, combining decades of expertise with zero mercury and lead additives.
PRECISION ENGINEERED FOR TIMEKEEPERS - Optimized for all watch sizes, from sleek thin models to robust multi-function timepieces.

Maxell 377 SR626SW is a premium 1.55V silver oxide watch battery, engineered in Japan for stable voltage and high energy density. Designed for precision quartz watches, it offers flat discharge characteristics and excellent leak resistance, supporting both low and high drain devices. This 4-pack ensures your timepieces run reliably with eco-conscious materials.

Compatible Devices	Watch
Color Name	Original Version
Batteries Included	No
Batteries Required	Yes
Brand	Maxell
Manufacturer	Maxell(Corp)USA
Item Model Number	4330210933
Size	4 Count (Pack of 1)
Package Dimensions	9.52 x 4.44 x 0.03 cm; 5 g

Maxell 377 SR626SW 1.55 Volt Silver Oxide Watch Battery Factory Hologram (4 Batteries)

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