upgrades and replacements
4.To insert a new battery pack, hold the battery label side down and at an angle, as shown.
The battery pack is keyed so that it can be inserted in only one direction. If the battery does not slide in easily, verify that the connector end of the battery lines up with the connector in the battery compartment.
Slide the connector end of the battery into position and then press down on the other end of the battery until it clicks into place.
5.Reconnect your cables.
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