{"product_id":"bak-65e-21700-6500mah-25a-battery-high-capacity-energy-cell","title":"BAK 65E 21700 6500mAh 25A Battery - High Capacity Energy Cell","description":"\u003cstyle\u003e\n    .battery-cell-template {\n      font-family: Arial, Helvetica, sans-serif;\n      color: #1f2937;\n      line-height: 1.6;\n      border: 1px solid #e5e7eb;\n      border-top: 6px solid var(--cell-accent);\n      border-radius: 18px;\n      overflow: hidden;\n      background: #ffffff;\n    }\n\n    .battery-cell-template-inner {\n      padding: 24px;\n    }\n\n    .battery-cell-template h2,\n    .battery-cell-template h3,\n    .battery-cell-template p,\n    .battery-cell-template ul,\n    .battery-cell-template table {\n      margin-top: 0;\n    }\n\n    .battery-cell-header {\n      background: linear-gradient(135deg, var(--cell-accent-soft), #ffffff 70%);\n      border: 1px solid var(--cell-accent-soft-border);\n      border-radius: 16px;\n      padding: 18px 18px 14px;\n      margin-bottom: 18px;\n    }\n\n    .battery-cell-header h2 {\n      margin-bottom: 10px;\n      line-height: 1.3;\n      color: #111827;\n    }\n\n    .battery-cell-badge {\n      display: inline-flex;\n      align-items: center;\n      gap: 8px;\n      padding: 8px 12px;\n      border-radius: 999px;\n      background: var(--cell-accent);\n      color: #ffffff;\n      font-size: 13px;\n      font-weight: 700;\n      margin-right: 6px;\n      margin-bottom: 6px;\n    }\n\n    .battery-cell-section-heading {\n      color: var(--cell-accent-muted);\n      border-left: 5px solid var(--cell-accent);\n      padding-left: 12px;\n      margin: 22px 0 14px;\n    }\n\n    .battery-cell-spec-table {\n      width: 100%;\n      border-collapse: collapse;\n      border: 1px solid #e5e7eb;\n      border-radius: 14px;\n      overflow: hidden;\n      margin-bottom: 18px;\n    }\n\n    .battery-cell-spec-table td {\n      border: 1px solid #e5e7eb;\n      padding: 11px 12px;\n      vertical-align: top;\n    }\n\n    .battery-cell-spec-label {\n      width: 34%;\n      background: var(--cell-accent-soft);\n    }\n\n    .battery-cell-spec-value a {\n      color: var(--cell-accent-muted);\n      font-weight: 700;\n    }\n\n    .battery-cell-highlight {\n      border: 1px solid var(--cell-accent-soft-border);\n      background: linear-gradient(135deg, var(--cell-accent-soft), #ffffff 85%);\n      border-radius: 14px;\n      padding: 14px 16px;\n      margin: 18px 0;\n    }\n\n    .battery-cell-template ul {\n      padding-left: 1.35rem;\n      margin-bottom: 16px;\n    }\n\n    .battery-cell-template li {\n      margin-bottom: 7px;\n    }\n  \u003c\/style\u003e\n\u003cdiv style=\"--cell-accent: #dc2626; --cell-accent-soft: #fee2e2; --cell-accent-soft-border: #fca5a5; --cell-accent-muted: #b91c1c;\" class=\"battery-cell-template\"\u003e\n\u003cdiv class=\"battery-cell-template-inner\"\u003e\n\u003cdiv class=\"battery-cell-header\"\u003e\n\u003ch2\u003e\u003cstrong\u003eBAK 65E N21700CX-65E 21700 Cell - 6500mAh - High-Capacity Lithium-Ion Energy Cell - Check Availability\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv class=\"battery-cell-badge\"\u003eTypical capacity: 6500mAh\u003c\/div\u003e\n\u003cdiv class=\"battery-cell-badge\"\u003eRated capacity: 6350mAh\u003c\/div\u003e\n\u003cdiv class=\"battery-cell-badge\"\u003eMax discharge: 25.4A, not for cycle use\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe \u003cstrong\u003eBAK 65E N21700CX-65E\u003c\/strong\u003e is a \u003cstrong\u003ehigh-capacity 21700 lithium-ion rechargeable cell\u003c\/strong\u003e designed for battery packs that prioritize \u003cstrong\u003elong runtime, high energy per cell, and efficient performance\u003c\/strong\u003e over extreme discharge current.\u003c\/p\u003e\n\u003cp\u003eAccording to the BAK specification, this cell offers a \u003cstrong\u003e6350mAh rated capacity\u003c\/strong\u003e, \u003cstrong\u003e6500mAh typical capacity\u003c\/strong\u003e, \u003cstrong\u003e3.5V nominal voltage\u003c\/strong\u003e, and up to \u003cstrong\u003e22.75Wh typical energy\u003c\/strong\u003e. This makes it a strong option for \u003cstrong\u003elong-range battery packs, portable power systems, solar backup packs, energy storage builds, and custom 21700 projects\u003c\/strong\u003e where capacity matters more than high-amp discharge.\u003c\/p\u003e\n\u003cp\u003eThe datasheet lists a \u003cstrong\u003e25.4A maximum discharge current\u003c\/strong\u003e, but this value is marked as \u003cstrong\u003enot for cycle use\u003c\/strong\u003e. For long service life, this cell should be used in a properly engineered battery pack with correct current sharing, BMS protection, adequate cooling, and temperature monitoring.\u003c\/p\u003e\n\u003ch3 class=\"battery-cell-section-heading\"\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable class=\"battery-cell-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eN21700CX-65E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eBAK\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eZhengzhou BAK Battery Co., Ltd.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e21700\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eRated Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e6350mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eTypical Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e6500mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eRated Energy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e22.23Wh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eTypical Energy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e22.75Wh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e3.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eMax Charge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eUpper Limited Charge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e4.25V absolute upper limit, not recommended for normal use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eEnd of Discharge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e2.50V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eDischarge Cut-Off Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e2.00V absolute lower limit, not recommended for normal use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eStandard Charge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e3175mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eStandard Discharge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e1270mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eMax Charge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e12.7A, not for cycle use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eMax Discharge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e25.4A, not for cycle use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eRate Discharge Performance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e1C: 100%, 2C: ≥95%, 3C: ≥90%, 4C: ≥85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eChemistry\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eLithium-Ion Rechargeable Cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003ePositive Terminal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eFlat Top\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eProtected\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eRechargeable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eInternal Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e≤8mΩ AC impedance at 1000Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e≤75g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eMax 21.7mm diameter x max 71.0mm height, with tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eCharge Temperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e0°C to 45°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eDischarge Temperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e-30°C to 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eMaximum Surface Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eCharge: 60°C max, Discharge: 70°C max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e1 year: -20°C to 25°C, 3 months: -20°C to 45°C, 1 month: -20°C to 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eCycle Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e501st cycle capacity ≥80% of original capacity, tested at 25°C with 0.5C charge and 1C discharge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eApplication Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eHigh Capacity \/ Energy Cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eDatasheet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eOfficial BAK specification available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"battery-cell-highlight\"\u003e\n\u003cstrong\u003eImportant note:\u003c\/strong\u003e This is not a 50A or 60A high-power cell. The BAK 65E is best treated as a high-capacity energy cell. The 25.4A maximum discharge current is listed as not for cycle use, so repeated high-current use should be avoided unless the pack is properly engineered and thermally monitored.\u003c\/div\u003e\n\u003ch3 class=\"battery-cell-section-heading\"\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Long-Range E-Bike Battery Packs\u003c\/li\u003e\n\u003cli\u003e✅ Electric Scooters with Moderate Current Demand\u003c\/li\u003e\n\u003cli\u003e✅ Portable Power Stations\u003c\/li\u003e\n\u003cli\u003e✅ Solar and Backup Energy Storage Packs\u003c\/li\u003e\n\u003cli\u003e✅ High-Capacity 21700 Battery Builds\u003c\/li\u003e\n\u003cli\u003e✅ Applications Prioritizing Runtime Over Extreme Discharge Current\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"battery-cell-highlight\"\u003e\u003cstrong\u003eDIY500AMP.COM Design - High Capacity 21700 Energy Cell\u003c\/strong\u003e\u003c\/div\u003e\n\u003ch3 class=\"battery-cell-section-heading\"\u003e\u003cstrong\u003e⚠️ Safety Warning for Lithium-Ion Battery Usage\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eCustomers should have a clear understanding of lithium-ion battery handling and safety before making a purchase. Lithium-ion batteries are highly sensitive and may pose fire, burn, or explosion risks if improperly handled. Always charge batteries on fire-resistant surfaces, and never leave them charging unattended.\u003c\/p\u003e\n\u003cp\u003eThis cell is intended for experienced users and battery-pack builders. It should be used only with proper protection, correct charging equipment, proper current path design, secure mechanical assembly, and adequate temperature monitoring. Compatibility with specific devices is not guaranteed.\u003c\/p\u003e\n\u003cp\u003eBy purchasing, you assume full responsibility for any injury, damage, or loss arising from incorrect use, improper pack construction, mishandling, short-circuiting, overheating, overcharging, physical damage, or use outside the manufacturer specifications.\u003c\/p\u003e\n\u003ch3 class=\"battery-cell-section-heading\"\u003e\u003cstrong\u003eImportant Usage Guidelines:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNot for Use in E-Cigarettes or Similar Devices\u003c\/li\u003e\n\u003cli\u003eBattery Pack Use Only\u003c\/li\u003e\n\u003cli\u003eMust Be Used with Proper Protective Circuitry or BMS\u003c\/li\u003e\n\u003cli\u003eUse Only with a Charger Designed for This Battery Type\u003c\/li\u003e\n\u003cli\u003eDo Not Exceed 4.20V Charge Voltage for Normal Use\u003c\/li\u003e\n\u003cli\u003eDo Not Discharge Below 2.50V During Normal Use\u003c\/li\u003e\n\u003cli\u003eDo Not Treat This as a 50A or 60A High-Power Cell\u003c\/li\u003e\n\u003cli\u003eMonitor Cell Temperature During High-Load Use\u003c\/li\u003e\n\u003cli\u003eSpot Weld Only - Do Not Solder Directly\u003c\/li\u003e\n\u003cli\u003eDo Not Short Circuit the Cell\u003c\/li\u003e\n\u003cli\u003eDo Not Disassemble, Crush, Puncture, or Deform the Cell\u003c\/li\u003e\n\u003cli\u003eDo Not Immerse in Water\u003c\/li\u003e\n\u003cli\u003eDo Not Mix with Other Brands, Types, Models, Old Cells, or Used Cells\u003c\/li\u003e\n\u003cli\u003eStore in a Cool, Dry, Well-Ventilated Area\u003c\/li\u003e\n\u003cli\u003eInspect Before Use and Do Not Use if Wrap Is Damaged\u003c\/li\u003e\n\u003cli\u003eKeep Away from Loose Metal Objects\u003c\/li\u003e\n\u003cli\u003eKeep Out of Reach of Children\u003c\/li\u003e\n\u003cli\u003eFollow Manufacturer Specs Strictly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e```\u003c\/p\u003e","brand":"BAK","offers":[{"title":"Default Title","offer_id":42895700164679,"sku":"BAK-65E-21700-6500MAH","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0588\/8055\/7127\/files\/FB8FF7DE-13A4-4122-8D48-C84788C043E6.jpg?v=1782750693","url":"https:\/\/diy500amp.com\/products\/bak-65e-21700-6500mah-25a-battery-high-capacity-energy-cell","provider":"DIY500AMP.COM","version":"1.0","type":"link"}