Mercury 150 EFI Service Manual page 21

MAINTENANCE
POSITIONING OUTBOARD FOR STORAGE
Store outboard in an upright (vertical) position to allow water to drain out of outboard.
If outboard is stored tilted up in freezing temperature, trapped cooling water or
rain water that may have entered the propeller exhaust outlet in the gear case
could freeze and cause damage to the outboard.
BATTERY STORAGE
1. Follow the battery manufacturers instructions for storage and recharging.
2. Remove the battery from the boat and check water level. Recharge if necessary.
3. Store the battery in a cool, dry place.
4. Periodically check the water level and recharge the battery during storage.
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CAUTION
90-883728 JULY 2001