BYD Battery-Box Premium LVS 4.0 4kWh Low Voltage Battery

The BYD Battery-Box Premium LVS 4.0 is a modular lithium iron phosphate (LFP) residential battery with 4 kWh usable energy capacity. It is designed for flexible expansion up to 256 kWh total storage by connecting up to 64 modules in parallel, with maximum six modules per battery tower and up to 16 × 4 battery towers per system.

The unit features cobalt-free LFP chemistry for enhanced safety and longevity, IP55 rating, 65 A continuous current capability, and round-trip efficiency of ≥95%. It supports both single-phase and three-phase low-voltage inverters and offers off-grid/backup functionality. The battery includes CAN/RS485 communication and integrated battery management with built-in patented modular plug design requiring no internal wiring.

Dimensions are 478 × 650 × 298 mm, weighing 45 kg per module. The product comes with a 10-year limited product and performance warranty covering retention of 60% usable energy or minimum throughput energy, whichever comes first. Base, cover, and BMU are sold separately.