BTI Replacement Battery #35 for APC - UPS battery - 1 x lead acid - black - for APC Back-UPS ES 350Don't get caught with a dead UPS, replace your battery today with the RBC35 replacement battery for APC models BE350C, BE350G, BE350R, BE350T, BE350U. Manufactured to BTI's highest quality standards, this sealed lead acid battery meets or exceeds the original manufacturer's specifications. At BTI quality is an obsession and BTI stands behind every battery product it builds. BTI... true to the original.