Add a spare or replacement battery to your 339, 668, or GK-7000 monitor with this 2600mAh Li-Ion Battery from Lilliput. The lithium-ion battery features a 2600mAh capacity to power your monitor for up to 3 hours. It is designed to replace the existing onboard battery on your monitor. The 3-pin terminal connector allows you to plug the battery into the monitor, and it features a DC power connector to charge using a separately available charger.