BLUETTI B500K — 5120Wh Expansion Battery

BLUETTI B500K — 5,120Wh High-Capacity Expansion Battery

The B500K is BLUETTI's high-capacity LiFePO4 expansion battery — designed to scale BLUETTI power systems to whole-home and off-grid territory with a single module. With 5,120Wh per battery (nearly double the B300K), it's the right choice when you need serious storage in fewer units. LiFePO4 chemistry delivers thousands of cycles and the long service life that makes battery scaling actually pay off versus traditional lead-acid.

Key Specs

• Capacity: 5,120Wh per module
• Battery Type: LiFePO4 (Lithium Iron Phosphate) — automotive-grade, thermally stable
• Compatible Systems: BLUETTI power stations supporting 5,120Wh expansion modules (confirm specific compatibility with your BLUETTI power station model)
• Scalability: Multiple modules can be paralleled for major capacity scaling
• Build Quality: Designed for both RV and residential installation
• Warranty: Standard BLUETTI battery warranty (verify exact term with BLUETTI dealer documentation)

What It Adds (capacity scaling)

• Single module (5,120Wh added): Nearly doubles a 2,764.8Wh power station's capacity — fridge + extended loads for 3-5 days
• Two modules (10,240Wh added): Off-grid cabin daily storage at residential scale
• Three modules (15,360Wh added): Multi-day whole-home backup capacity

Why LiFePO4 Per kWh Beats Lead-Acid

A 5,120Wh LiFePO4 battery delivers roughly 20× the lifetime energy of comparable lead-acid storage. Per kWh stored over the battery's life: lead-acid ~$0.13/kWh, LiFePO4 ~$0.02/kWh. The upfront price scares people. The per-kWh-over-lifespan math is what makes high-capacity LiFePO4 expansion the smart play for serious off-grid use.

Pairs Well With

• BLUETTI Apex 300 — 3,840W Portable Power Station — pair for major capacity expansion
• BLUETTI B300K Expansion Battery — pair B500K with B300K for fine-tuned capacity sizing
• BLUETTI Sora 220 Solar Panel — solar input to keep larger banks topped up
• BLUETTI PV100FX Dual Solar Kit — 200W folding solar for portable setups

Not sure what size you need? Use our free Power Station Size Calculator to get a personalized recommendation in under 2 minutes — factors in real-world appliance duty cycles so you don't undersize.

Warranty & Support

BLUETTI 5-year manufacturer warranty (2-year on accessory items like ePad). TrailVault is an authorized BLUETTI dealer — full warranty support, genuine products, and direct human contact at joel@trailvault.co.