377 Silver Oxide Watch Battery from Mexico
The 377 (SR626/377) silver oxide button battery powers quartz watches and instruments, with volume under 300 cm³. HTS 8506.40.1010 covers these primary non-rechargeable coin cells using silver oxide electrolyte. Known for low self-discharge and stable performance.
Duty Rate — Mexico → United States
12.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Include certificates of analysis showing silver content >28% of cathode material per tariff definition
• Segregate from lithium batteries during transport; silver oxide cells have different UN numbers (UN3090 vs UN3480)
• Watch for anti-dumping duties on certain Asian silver oxide cells; check Commerce Department scopes