Dell NU209 rechargeable battery packs fit 5i and 6i Poweredge Perc systems. These packs are fully compatible with P9110, U8735, FR463, and XJ547 equipment. Strong Li-ion cells give you a long-lasting charge. The case is nearly identical to the original battery; simply drop this one into the old compartment for easy installation. The thin size gives you the option of using it with rack-mounted equipment.