Seiko Instruments DPU-S445 - Manual (Page 39)

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NOTE
- When the battery charger is connected to the outlet, do not bring any
metal object into contact with the metal terminal.
- Unplug the battery charger from the outlet after using. Remove the
recharged battery pack from the battery charger within 24 hours.
HINT
• The battery pack should be recharged at 32 to 95°F (0 to 35°C) for
optimum performance.