External Battery Pack Gives Your Compatible Tripp Lite UPS System Extended Runtime. The BP36V27-2US is compatible only with select 36V DC Tripp Lite UPS systems that specify the use of this battery pack. Not only does it provide extended runtime, but it can also be daisy-chained using its rear connector to additional external battery packs for even longer extended-run operation. Heavy-gauge cabling with high-current two-point DC connector is included for simple installation. Optional-use rear-panel battery detection jacks automatically configure host UPS systems supporting this feature for one or more external battery packs. The steel housing supports mounting in 2U of space in EIA-standard 19" racks using the included 4-post rack-mounting brackets. The BP36V27-2US is also compatible with Tripp Lite's 2-9USTAND for upright tower configuration, 2POSTRMKITWM for 2-post racks or wall installation and UPDHDEARKIT for 2-point front-rail rack installation without rear supports (all accessories sold separately).