Community verified— Verified from trusted watchmaker & collector sources
What Battery Does Citizen Eco-Drive BM8180 Use?
Battery
MT621
Rechargeable lithium-titanium accumulator
- Battery life
- ≈ 8–12+ years (solar charged)
- Voltage
- 3V
- Caliber
- E101
Important: Eco-Drive uses light energy to charge a rechargeable MT621 accumulator — never needs a disposable battery replacement under normal use.
Compatible MT621 Batteries
Citizen (OEM)Panasonic
All listed brands are direct equivalents. Always use Rechargeable lithium-titanium accumulator chemistry.
Other Names for MT621
MT621Panasonic MT621CTL621
See full cross-reference table How to Replace the Battery in Citizen Eco-Drive BM8180
- The BM8180 uses a rechargeable MT621 accumulator — NOT a disposable battery
- Keep the watch exposed to light regularly to maintain charge
- If the watch stops after dark storage, expose it to light for several hours to recharge
- The accumulator lasts 8–12+ years before capacity fades
- Accumulator replacement should be done by an authorised Citizen service centre
Related Watch Models
Data verification
Battery information is based on manufacturer documentation where available and community-verified sources. If you notice an error or have official documentation for this model, please contact us to help improve this database.