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23 July 2026
Power Expansion for Every Situation ●[Boost Capacity] – This 2764.8Wh battery adds more power to power stations: AC200MAX, AC200L, AC300, and AC500, allowing you to upgrade your setup as your needs grow. ●[Support Mix Use] – Combine the B300K with other BLUETTI batteries like the B300, B300S, B230, and B210 for a seamless upgrade to your setup. For example, AC500+B300S+B300K = 5,836.8Wh. ●[Light Weight] – It weighs only 29.5kg / 65lbs and can be fixed to the wall. It greatly saves your indoor space and is also very convenient to carry outdoors. ●[Long-lasting Safety] – Upgraded LiFePO4 batteries with 4,000+ cycles, built-in cooling fan, and AI-powered BMS ensure stable and optimal performance for years to come. ●[What You Get] – BLUETTI B300K expansion battery, P090A battery expansion cable for power station AC200L AC300 AC200MAX and user manual. FAQs ●Q1: How to upgrade the B300K? ●A: Connect the B300K to the power station and upgrade it via the BLUETTI app in Settings > Firmware Upgrade. Follow in-app instructions. ●Q2: Can it charge and discharge at the same time? ●A: Yes, the B300K supports pass-through charging. ●Q3: Why doesn’t the B300K drain all its power? ●A: The B300K reserves some energy to avoid overdischarging and protect the battery’s lifespan. ●Q4: Can I leave the battery uncharged after fully discharging? ●A: No, charge promptly after use to prevent damage. Keep the battery in the environment of at least 10°C (50°F) for at least 12 hours beforehand. Preview Compare B300K $1,199.00 $1,499.00 B300 $1,599.00 $1,999.00 B300S $1,799.00 $2,299.00 B230 $1,099.00 $1,299.00 Capacity 2,764.8Wh 3,072Wh 3,072Wh 2,048Wh Battery Type LiFePO₄ LiFePO₄ LiFePO₄ LiFePO₄ Life Cycles 4,000+ (80%) 3,500+ (80%) 3,500+ (80%) 3,500+ (80%) USB-A Output 1* 5V/2.4A, 12W 1* 3.6V-12V / 3A, 18W 1* 3.6V-12V / 3A, 18W 1* 3.6V -12V / 3A, 18W Dimensions 52.5 x 32.7 x 20.cm 20.67 x 12.87 x 8.23in 52 × 32 × 26.6cm 20.5 x 12.5 x 10.5 in 52 x 32 x 26.6cm 20.5×12.6×10.4in 42 x 28 x 22.7cm 16.5 x 11.0 x 8.91in Weight 29.5kg / 65.04lbs 36.1kg / 79.6lbs 38kg / 83.8lbs 21.8kg / 48lbs Warranty 3+1 Years 4 Years 4 Years 4 Years Compatibility AC200L, AC200MAX, AC300, AC500 AC200L, AC300, AC500 AC500 AC200MAX, AC200P, EB150, EB240, AC200L You may also likeBLUETTI AC200L 2400W 2048Wh Portable Power Station Home Backup Extreme Weather1499.0 USDFree shippingBLUETTI AC300 B300 3000W 3072Wh UPS Power Station Solar Generator Outage Backup2599.0 USDFree shippingBLUETTI B300 3072Wh Solar Generator AC300 AC500 Extra Battery LFP Power Station1799.0 USDFree shipping
