===== HB21 BATTERY PRODUCT PAGE CSS (house style) ===== /.hb21-spec-wrap max-width: 1100px; margin: 0 auto 40px auto; padding: 0 20px; text-align: center;.hb21-spec-wrap h2,.hb21-spec-wrap h3,.hb21-spec-wrap p,.hb21-spec-wrap li text-align: center;.hb21-product-intro max-width: 920px; margin: 0 auto 30px auto;.hb21-product-intro h2 margin: 0 0 14px 0; font-size: 2rem; line-height: 1.2;.hb21-product-intro p margin: 0 auto 14px auto; line-height: 1.7; max-width: 900px;.hb21-spec-grid display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-top: 30px; text-align: left;.hb21-spec-card background: #f7f7f7; border-radius: 14px; padding: 24px; text-align: left;.hb21-spec-card h3 margin: 0 0 16px 0; font-size: 1.25rem; text-align: left;.hb21-spec-card ul list-style: none; padding: 0; margin: 0;.hb21-spec-card li margin: 0 0 10px 0; line-height: 1.55; text-align: left;.hb21-spec-card strong font-weight: 700;.hb21-warranty-note margin-top: 28px; font-size: 1rem; line-height: 1.6; text-align: left;.hb21-section max-width: 1100px; margin: 0 auto; padding: 34px 20px; text-align: center;.hb21-section h2,.hb21-section h3 font-size: 2rem; line-height: 1.2; font-weight: 700; margin: 0 0 14px 0; text-align: center;.hb21-section p max-width: 900px; margin: 0 auto 14px auto; line-height: 1.65; text-align: center;.hb21-section a,.hb21-faq-item a color: #0066cc; text-decoration: underline;.hb21-footnote font-size: 0.9rem; color: #555; margin-top: 10px;.hb21-image-full max-width: 1100px; margin: 0 auto; padding: 14px 20px;.hb21-image-full img display: block; width: 100%; height: auto; margin: 0 auto; border-radius: 8px;.hb21-video-wrap max-width: 1100px; margin: 0 auto; padding: 14px 20px;.hb21-video-wrap.hb21-video-embed position: relative; width: 100%; padding-bottom: 56.25%; height: 0; overflow: hidden; border-radius: 8px;.hb21-video-wrap.hb21-video-embed iframe position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0;.hb21-card-grid max-width: 1100px; margin: 0 auto; padding: 14px 20px; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px;.hb21-card text-align: center;.hb21-card img display: block; width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; object-fit: cover; aspect-ratio: 4 / 3;.hb21-card h3 margin: 0 0 6px 0; font-size: 1.1rem; line-height: 1.3; text-align: center;.hb21-card p margin: 0; line-height: 1.5; font-size: 0.95rem; text-align: center;.hb21-card-compact h3 font-size: 0.95rem; margin-bottom: 4px;.hb21-card-compact p font-size: 0.85rem; line-height: 1.4;.hb21-faq-wrap max-width: 980px; margin: 40px auto 20px auto; padding: 0 20px; text-align: center;.hb21-faq-wrap h2 font-size: 2rem; line-height: 1.2; margin-bottom: 20px; text-align: center;.hb21-faq-item background: #f7f7f7; border-radius: 12px; padding: 18px 20px; margin-bottom: 14px; text-align: left;.hb21-faq-item h3 margin: 0 0 8px 0; font-size: 1.1rem; line-height: 1.4; text-align: left;.hb21-faq-item p margin: 0; line-height: 1.65; text-align: left; @media (max-width: 989px).hb21-spec-grid grid-template-columns: 1fr;.hb21-card-grid grid-template-columns: repeat(2, minmax(0, 1fr));.hb21-product-intro h2,.hb21-section h2,.hb21-section h3,.hb21-faq-wrap h2 font-size: 1.7rem; @media (max-width: 749px).hb21-card-grid grid-template-columns: 1fr; Overview
The BLUETTI B500K is a 5120Wh LiFePO4 expansion battery that adds stored capacity to a compatible BLUETTI power station, extending its runtime for home backup, off-grid living, motorhomes, and long winter outages. It is an add-on battery, not a standalone unit: it stores energy for a host power station and does not provide AC output on its own.
The cells are LiFePO4, rated for 4000 cycles to 80 percent of their original capacity, so the pack is built to last through years of daily use. The B500K connects to its host with the included CA90 short cable, and multiple units stack to build a much larger system (BLUETTI rates a full multi-host setup to over 100kWh). It is the current-generation replacement for the discontinued B300S. BLUETTI B500K Specs:
- Capacity: 5120Wh
- Cell Chemistry: LiFePO4 (Lithium Iron Phosphate)
- Cycle Life: 4000 cycles to 80 percent of original capacity
- Weight: 45kg
- Dimensions: 520 x 327 x 308.5mm
- Expansion Ports: 2 x expansion port, 58.4V DC max, 90A max
- Charging Current: 65A max
- Discharging Current: 70A max
- Charging Temperature: 0°C to 40°C
- Discharging Temperature: -20°C to 40°C
- Storage Temperature: -20°C to 40°C (up to 1 month); -20°C to 25°C (up to 6 months)
- Working Humidity: 5 percent to 95 percent RH
- Enclosure Rating: IP20 (indoor use)
- Monitoring: BLUETTI app What's in the Box?
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