Furuno COLOR SCANNING CSH-23F/24F - Manual (Page 104)

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Memory card battery replacement
CAUTION
Use only the specified battery.
Use of a different battery may cause
explosion.
Replace the memory card battery
within 10 minutes. Data may be lost if
the battery is not replaced within that
period.
1. Slide the release leftward with your thumbnail.
2. Pull out the battery case, then remove the battery.
3. Insert new battery in case, plus (+) side up.
4. Insert the battery case.
5. Slide the release rightward to lock the battery case.
Release
Plus (+) side up
Battery case
How to replace the battery in the memory card