Bti 451-bcuy-bti 3-cell 11.55v li-ion notebook battery for dell latitude 9420 2-Power your notebook with confidence using the BTI Battery, a rechargeable, proprietary size battery engineered for dependable performance. Designed to deliver stable 11. 55 V DC power and configured with three cells, this BTI Battery is built to support productive days, long study sessions, and on the go work without frequent interruptions. The proprietary size ensures a precise fit, securing a reliable connection and reducing wear on connectors,