3M MP180 Operator's Manual page 14

Battery Charging Notes:
• If the projector power is off, allow three hours for the battery to fully recharge.
If the projector power is on, the battery will take longer to charge.
• The battery has a lifespan and ages every time it is fully charged and
discharged. The battery will gradually loose charge capacity as it ages.
Therefore, as the battery ages the battery life will decrease.
Battery Maintenance Tips:
• Remove the battery when the projector will not be used for one week or
longer.
• Charge and discharge the battery by turning on the projector at least once a
month.
• When storing the battery for more than a month, store it at 50% charge. The
battery is at 50% charge when the battery icon has three bars.
• Do not store a fully discharged battery because it may lose the ability to be
recharged.
• Do not store a fully charged battery because it may lose the ability to be
recharged to full power.
3M
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Pocket Projector 180
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