377 Battery · Silver Oxide 1.55V
The 6.8 mm watch battery — SR626SW designation, AG4 crossover.
Specifications
- Voltage
- 1.55V
- Diameter
- 6.8 mm
- Thickness
- 2.6 mm
- Capacity
- 24 mAh
- Weight
- 0.3 g
- UL
- UN38.3
- CE
- RoHS
- ISO9001
A 377 watch battery replacement is the most common watch repair job - one cell, one number, and the same 6.8 mm size as AG4 and SR626SW.
377 vs SR626SW is a naming question, not a product question: same cell. We supply both labels; distributors stock one and match both.
Where it is used
- Watches
- Small electronics
Equivalent & Cross-Reference
- SR626SW
- AG4
- SG4
Packing quantities are standard; other formats on request.
377 vs SR626SW
377, SR626SW and AG4 are the same 6.8 × 2.6 mm cell. The three-letter suffix (SW) marks the watch-grade standard - our cells match the marking at 1.55V.
Wholesale & Custom Supply
Watch battery 377 in carded retail packs or bulk inner boxes, with cross-reference lists for distributors and repair channels.
Battery Information for the EU Market
For each model we publish its full battery information file under Regulation (EU) 2023/1542 — chemistry system, performance data, hazardous substances statement and related documents.
General Information
- Battery Name
- Alkaline Zn-MnO₂ LR626/LR626H button cell (non-rechargeable)
- Category
- Portable battery
- Chemistry system
- Zn-MnO₂
- Model
- LR626/LR626H
- Trade/Brand name
- TianQiu/No-brand/OEM brands
- Nominal Voltage
- 1.5V
- Production Date
- According to customer requirements, generally printed on the battery body:Y-M For example: 64=2026-04 6X=2026-10 6Y=2026-11 6Z=2026-12
- Shelf Life
- One years under normal storage conditions
- Country of Origin
- China
Manufacturer
European Authorized Representative
- Apex CE Specialists GmbH
- Grafenberger Allee 277, 40237 Düsseldorf, DE
- Contact: Wells Yan
- Email: Info@apex-ce.com
- Tel: +49 2131 206 6043
Battery Characteristics Data Sheet
| Type | Approx. Weight | Capacity | MAD |
|---|---|---|---|
| Normal | 0.3g | 13mAh | 450.0 hours |
| Extra | 0.3g | 15.5mAh | 530.0 hours |
◆ Capacity & MAD test condition: 47KΩ 24h/day to 1.2V @ 20±2℃◆ Approx. weight only for reference
Critical Raw Materials
- Manganese
- Graphite
Hazardous Substances & SVHC Statement
No substances listed in the REACH Candidate List of Substances of Very High Concern (SVHC) are present above 0.1% w/w.
Related Documents
Manufacturer: DongGuan Tianqiu Enterprise Co., Ltd. — assessed against Articles 6 & 13 of Regulation (EU) 2023/1542.
FAQ
What is a 377 battery?
A 1.55V button cell (silver-oxide crossover), 6.8 × 2.6 mm - also stamped SR626SW or AG4.
What battery replaces 377?
SR626SW, AG4 and SG4 are direct equivalents.
How long does a 377 watch battery last?
Typically 1–3 years in a quartz watch depending on features.
Is a 377 the same as AG4?
Yes — same size and chemistry, different naming.
Are 377 batteries silver oxide?
The 377 designation follows the silver-oxide naming; our cells match the marking at 1.55V.
