{"product_id":"bluetti-b300k-expansion-battery-2-764-8wh","title":"BLUETTI B300K Expansion Battery | 2764.8Wh","description":"\u003cstyle\u003e\n\/* ===== HB21 BATTERY PRODUCT PAGE CSS (house style) ===== *\/\n.hb21-spec-wrap { max-width: 1100px; margin: 0 auto 40px auto; padding: 0 20px; text-align: center; }\n.hb21-spec-wrap h2, .hb21-spec-wrap h3, .hb21-spec-wrap p, .hb21-spec-wrap li { text-align: center; }\n.hb21-product-intro { max-width: 920px; margin: 0 auto 30px auto; }\n.hb21-product-intro h2 { margin: 0 0 14px 0; font-size: 2rem; line-height: 1.2; }\n.hb21-product-intro p { margin: 0 auto 14px auto; line-height: 1.7; max-width: 900px; }\n.hb21-spec-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-top: 30px; text-align: left; }\n.hb21-spec-card { background: #f7f7f7; border-radius: 14px; padding: 24px; text-align: left; }\n.hb21-spec-card h3 { margin: 0 0 16px 0; font-size: 1.25rem; text-align: left; }\n.hb21-spec-card ul { list-style: none; padding: 0; margin: 0; }\n.hb21-spec-card li { margin: 0 0 10px 0; line-height: 1.55; text-align: left; }\n.hb21-spec-card strong { font-weight: 700; }\n.hb21-warranty-note { margin-top: 28px; font-size: 1rem; line-height: 1.6; text-align: left; }\n.hb21-section { max-width: 1100px; margin: 0 auto; padding: 34px 20px; text-align: center; }\n.hb21-section h2, .hb21-section h3 { font-size: 2rem; line-height: 1.2; font-weight: 700; margin: 0 0 14px 0; text-align: center; }\n.hb21-section p { max-width: 900px; margin: 0 auto 14px auto; line-height: 1.65; text-align: center; }\n.hb21-section a, .hb21-faq-item a { color: #0066cc; text-decoration: underline; }\n.hb21-footnote { font-size: 0.9rem; color: #555; margin-top: 10px; }\n.hb21-image-full { max-width: 1100px; margin: 0 auto; padding: 14px 20px; }\n.hb21-image-full img { display: block; width: 100%; height: auto; margin: 0 auto; border-radius: 8px; }\n.hb21-video-wrap { max-width: 1100px; margin: 0 auto; padding: 14px 20px; }\n.hb21-video-wrap .hb21-video-embed { position: relative; width: 100%; padding-bottom: 56.25%; height: 0; overflow: hidden; border-radius: 8px; }\n.hb21-video-wrap .hb21-video-embed iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; }\n.hb21-card-grid { max-width: 1100px; margin: 0 auto; padding: 14px 20px; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }\n.hb21-card { text-align: center; }\n.hb21-card img { display: block; width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; object-fit: cover; aspect-ratio: 4 \/ 3; }\n.hb21-card h3 { margin: 0 0 6px 0; font-size: 1.1rem; line-height: 1.3; text-align: center; }\n.hb21-card p { margin: 0; line-height: 1.5; font-size: 0.95rem; text-align: center; }\n.hb21-card-compact h3 { font-size: 0.95rem; margin-bottom: 4px; }\n.hb21-card-compact p { font-size: 0.85rem; line-height: 1.4; }\n.hb21-faq-wrap { max-width: 980px; margin: 40px auto 20px auto; padding: 0 20px; text-align: center; }\n.hb21-faq-wrap h2 { font-size: 2rem; line-height: 1.2; margin-bottom: 20px; text-align: center; }\n.hb21-faq-item { background: #f7f7f7; border-radius: 12px; padding: 18px 20px; margin-bottom: 14px; text-align: left; }\n.hb21-faq-item h3 { margin: 0 0 8px 0; font-size: 1.1rem; line-height: 1.4; text-align: left; }\n.hb21-faq-item p { margin: 0; line-height: 1.65; text-align: left; }\n@media (max-width: 989px) {\n  .hb21-spec-grid { grid-template-columns: 1fr; }\n  .hb21-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }\n  .hb21-product-intro h2, .hb21-section h2, .hb21-section h3, .hb21-faq-wrap h2 { font-size: 1.7rem; }\n}\n@media (max-width: 749px) { .hb21-card-grid { grid-template-columns: 1fr; } }\n\u003c\/style\u003e\n\n\u003cdiv class=\"hb21-spec-wrap\"\u003e\n\u003cdiv class=\"hb21-product-intro\"\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe BLUETTI B300K is a 2764.8Wh LiFePO4 expansion battery that adds capacity to a compatible BLUETTI power station. It suits home backup, off-grid setups, motorhomes, and extended NZ outages. The B300K is the current-generation replacement for the discontinued B300, and it can still be stacked alongside existing B300 and B300S batteries, so an older system can grow without starting again.\u003c\/p\u003e\n\u003cp\u003eThe B300K pairs with the BLUETTI Apex 300, AC300, AC500, AC200MAX and AC200L. The Apex 300 alone accepts up to six batteries, taking total system capacity to 19353.6Wh. The included P090A cable fits the AC300, AC200MAX and AC200L. The Apex 300 and the AC500 each connect with a different cable, sold separately (details in the compatibility section below). The B300K recharges through its host station, reaching 80% in around 45 minutes on an AC300 or AC500. It is not a standalone power station and has no AC output of its own. The built-in USB-A port charges phones and small devices directly. Please confirm compatibility with us before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-spec-grid\"\u003e\n\u003cdiv class=\"hb21-spec-card\"\u003e\n\u003ch3\u003eBLUETTI B300K Specs:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 2764.8Wh (51.2V, 54Ah)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Type:\u003c\/strong\u003e LiFePO4 (Lithium Iron Phosphate)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLife Cycles:\u003c\/strong\u003e 4000+ cycles to 80% original capacity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpansion Ports:\u003c\/strong\u003e 2 x Expansion Port, 58.4VDC Max., 90A Max.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB-A Port:\u003c\/strong\u003e 12W Max., 5V \/ 2.4A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharging Current:\u003c\/strong\u003e 60A Max.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarging Current:\u003c\/strong\u003e 70A Max.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 29.5kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (L x W x D):\u003c\/strong\u003e 525 x 327 x 209mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharging Temperature:\u003c\/strong\u003e 0°C to 40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarging Temperature:\u003c\/strong\u003e -20°C to 40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e up to 1 month: -20°C to 40°C; up to 6 months: -20°C to 25°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Humidity:\u003c\/strong\u003e 5% to 95%RH\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-spec-card\"\u003e\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x BLUETTI B300K Expansion Battery\u003c\/li\u003e\n\u003cli\u003e1 x Battery Expansion Cable (P090A)\u003c\/li\u003e\n\u003cli\u003e1 x User Manual\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0528\/2424\/4410\/files\/bluetti-b300k-user-manual.pdf?v=1783908288\" title=\"Download the BLUETTI B300K user manual (PDF)\" target=\"_blank\" rel=\"noopener\"\u003eDownload the BLUETTI B300K user manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 4-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"hb21-warranty-note\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e The B300K is an expansion battery, not a standalone power station. A compatible BLUETTI power station (sold separately) is required for AC output and for recharging the battery.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hb21-image-full\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0528\/2424\/4410\/files\/bluetti-b300k-expansion-battery-2-764-8w-hero.webp?v=1783929435\" alt=\"BLUETTI B300K feature overview showing compatibility with the AC300, AC200L, AC200MAX and AC500, modular expansion, fast charging to 80% in 45 minutes and 4000+ cycle LiFePO4 cells\"\u003e\u003c\/div\u003e\n\n\u003cdiv class=\"hb21-section\"\u003e\n\u003ch2\u003ePower Expansion for Every Situation\u003c\/h2\u003e\n\u003cp\u003eThe B300K adapts to your setup, whether you are backing up the house through an outage or powering an off-grid weekend. Stack multiple B300K batteries on one host, or mix and match with existing B300 and B300S batteries, and scale the system to the capacity you actually need rather than replacing what you already own.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-image-full\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0528\/2424\/4410\/files\/bluetti-b300k-expansion-battery-2-764-8w-marketing-expansion.webp?v=1783908291\" alt=\"Up to four BLUETTI B300K expansion batteries stacked with an AC300 power station, including mixed setups with older B300 units\"\u003e\u003c\/div\u003e\n\n\u003cdiv class=\"hb21-section\"\u003e\n\u003ch2\u003eCompatible Across the BLUETTI Range\u003c\/h2\u003e\n\u003cp\u003eThe B300K integrates with the AC300 (up to 4 batteries for 11059.2Wh of added capacity), the AC500 (up to 6 batteries, 16588.8Wh added), and the AC200MAX and AC200L (up to 2 batteries each, 5529.6Wh added). It also pairs with the current BLUETTI Apex 300, which accepts up to six B300K for 19353.6Wh of total system capacity (including the Apex 300's own 2764.8Wh battery).\u003c\/p\u003e\n\u003cp class=\"hb21-footnote\"\u003eThe included P090A cable fits the AC300, AC200MAX and AC200L. The Apex 300 requires a P090D cable and the AC500 a P090D to P150D cable; both are sold separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-image-full\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0528\/2424\/4410\/files\/bluetti-b300k-expansion-battery-2-764-8w-marketing-compatibility.webp?v=1783908291\" alt=\"Diagram of the BLUETTI B300K connecting to the AC300, AC200L, AC200Max and AC500 power stations with the P090A and P090D to P150D cables\"\u003e\u003c\/div\u003e\n\n\u003cdiv class=\"hb21-section\"\u003e\n\u003ch2\u003eLiFePO4 Cells Built to Last\u003c\/h2\u003e\n\u003cp\u003eThe B300K uses square LiFePO4 cells rated for 4000+ charge cycles to 80% of original capacity, managed by BLUETTI's AI-BMS battery management system. An aluminium casing and an efficient cooling fan protect the pack, so the battery keeps working through years of regular charging and discharging.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hb21-section\"\u003e\n\u003ch2\u003e80% Charged in 45 Minutes\u003c\/h2\u003e\n\u003cp\u003ePaired with an AC300 or AC500, the B300K recharges to 80% in around 45 minutes, so a short window of mains power or generator time puts most of the capacity back before the next outage or the next leg of the trip.\u003c\/p\u003e\n\u003cp class=\"hb21-footnote\"\u003eCharge rate is managed by the host power station and slows outside the 0°C to 40°C charging temperature range.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hb21-section\"\u003e\n\u003ch2\u003eUSB-A Port for Direct Charging\u003c\/h2\u003e\n\u003cp\u003eA built-in 12W USB-A port lets the B300K top up phones, tablets, and small devices on its own, handy in a tent or during an outage when the host station is busy elsewhere. For anything bigger, the B300K feeds its capacity through a connected BLUETTI power station.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hb21-image-full\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0528\/2424\/4410\/files\/bluetti-b300k-witb-composed.webp?v=1784195019\" alt=\"What's in the box for the BLUETTI B300K: the expansion battery and the P090A battery expansion cable\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-section\"\u003e\n\u003ch2\u003ePairs Well With\u003c\/h2\u003e\n\u003cp\u003eThe B300K is built to expand a BLUETTI power station system. For a current-generation setup it pairs with the \u003ca href=\"https:\/\/hb21.co.nz\/products\/bluetti-apex-300-portable-power-station-3840w-2764-8wh\" title=\"BLUETTI Apex 300 Portable Power Station\"\u003eBLUETTI Apex 300\u003c\/a\u003e, which accepts up to six B300K batteries for whole-home backup, and it also expands the AC300, AC500, AC200MAX and AC200L. If you want more capacity from each battery, the \u003ca href=\"https:\/\/hb21.co.nz\/products\/bluetti-b500k-expansion-battery-5-120wh\" title=\"BLUETTI B500K Expansion Battery\"\u003eBLUETTI B500K Expansion Battery\u003c\/a\u003e is an alternative for the same hosts, adding 5120Wh per unit rather than 2764.8Wh. If you are unsure which host or cable your setup needs, please confirm compatibility with us before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hb21-faq-wrap\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hb21-faq-item\"\u003e\n\u003ch3\u003eDoes the B300K work with the BLUETTI Apex 300?\u003c\/h3\u003e\n\u003cp\u003eYes. The \u003ca href=\"https:\/\/hb21.co.nz\/products\/bluetti-apex-300-portable-power-station-3840w-2764-8wh\" title=\"BLUETTI Apex 300 Portable Power Station\"\u003eApex 300\u003c\/a\u003e accepts up to six B300K expansion batteries, taking the total system capacity to 19353.6Wh, enough for extended whole-home backup or serious off-grid use. Note that the Apex 300 connects with a P090D cable, which is sold separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-faq-item\"\u003e\n\u003ch3\u003eWhich other BLUETTI power stations is the B300K compatible with?\u003c\/h3\u003e\n\u003cp\u003eThe B300K works with the AC300 (up to 4 batteries), AC500 (up to 6 batteries), AC200MAX (up to 2), and AC200L (up to 2). The included P090A cable covers the AC300, AC200MAX and AC200L. Connecting to the AC500 requires a P090D to P150D cable, which is sold separately. If you are unsure about your model, contact us before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-faq-item\"\u003e\n\u003ch3\u003eCan the B300K power appliances on its own?\u003c\/h3\u003e\n\u003cp\u003eNo. The B300K has no AC output of its own, so it cannot run appliances as a standalone unit. It does have a 12W USB-A port for charging phones and small devices directly; everything else runs through the connected host power station.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-faq-item\"\u003e\n\u003ch3\u003eCan I mix the B300K with my older B300 or B300S batteries?\u003c\/h3\u003e\n\u003cp\u003eYes. The B300K can be stacked alongside existing B300 and B300S batteries on a compatible host, so you can add capacity to an older system without replacing the batteries you already own. One exception: on the Apex 300, BLUETTI recommends against mixing battery models, so keep an Apex setup to B300K units only.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-faq-item\"\u003e\n\u003ch3\u003eIs the B300K a replacement for the B300?\u003c\/h3\u003e\n\u003cp\u003eYes. The B300K is the current-generation successor to the discontinued B300, with the same 2764.8Wh LiFePO4 capacity class. Existing B300 owners can keep using their batteries and add B300K units alongside them.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-faq-item\"\u003e\n\u003ch3\u003eHow fast does the B300K recharge?\u003c\/h3\u003e\n\u003cp\u003eConnected to an AC300 or AC500, the B300K recharges to 80% in around 45 minutes. Charging is managed by the host power station, and the rate reduces outside the 0°C to 40°C charging temperature range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hb21-faq-item\"\u003e\n\u003ch3\u003eHow long will the battery last?\u003c\/h3\u003e\n\u003cp\u003eThe LiFePO4 cells are rated for 4000+ charge cycles before capacity drops to 80% of new. At one full cycle per day, that works out to more than a decade of use. The pack itself is backed by a 4-year warranty.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n","brand":"BLUETTI","offers":[{"title":"Default Title","offer_id":45946073219258,"sku":"B300K","price":2999.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0528\/2424\/4410\/files\/B300K_1x_adf268f9-fec9-462b-9271-41016194a49e.png?v=1783908947","url":"https:\/\/hb21.co.nz\/products\/bluetti-b300k-expansion-battery-2-764-8wh","provider":"HB21","version":"1.0","type":"link"}