M12USWH - APC High Capacity Mobile Power Pack for BGE50ML Network UPS, "The BGE50MLs lithium ion battery is also a removable mobile power pack (M12USWH), so you can charge your mobile devices on the go. Recharge your mobile devices anywhere: The mobile power pack provides 5+ full charges to a smartphone when you're on the go, Smart charging feature recognizes devices and charges them at maximum speed, LED Status Indicators