Powersmart DB2821 Manuel D'instructions page 16

TO INSTALL BATTERY PACK (See Figure 6)
Lift and hold up the battery door.
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Place the battery pack on the mower. Align guided ribs on battery pack with grooves
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in the product's battery port.
Make sure the latch on bottom of the battery pack snaps in place and that battery
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pack is fully seated and secure in the product before beginning operation.
Insert the safety key.
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If the machine is not going to be used immediately, do not insert the safety key.
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Close the door.
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Figure 6
TO REMOVE BATTERY PACK (See Figure 6)
Release the power lever to stop the product.
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Remove the safety key.
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Press and hold the battery latch button at the bottom of the battery pack.
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Remove battery pack from the product.
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Battery Door
Safety Key
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Battery Pack