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12V 628Ah Bluetooth LiFePO4 Battery | 300A BMS | 8038Wh
🛡️ European Automotive Standards (ECE R10 Certified)
- Compact Design: 18.9 X 14.25 X 9.53 inch | 153.99 lbs.
- Massive Capacity: 628Ah (12.8V) | ~8kWh energy storage in a single unit.
- 3X weight energy density of lead-acid batteries making it suitable for scenarios that require lightweighting (such as RVs and ships).
- Ultra-Long Cycle Life: 6,000+ cycles at 80% depth of discharge (DoD)—outperforming standard LiFePO4 batteries.
- High Power Output: Continuous 300A discharge (3,840W) for heavy-duty inverters and equipment.
- Smart Bluetooth Monitoring: Track real-time voltage, state of charge (SoC), temperature, and health via WattCycle app.
- Robust 300A BMS with 8X Protections: Over-current, short-circuit, and thermal safeguards.
- Low/high-temperature cutoffs (charge: -5°C/23°F to 60°C/140°F; discharge: -25°C/-13°F to 75°C/167°F).
- Scalable Design: Supports up to 4-series (51.2V) and 4-parallel (2,512Ah) configurations with 128.61kWh usable energy.
- Military-Grade Build: UL94 V-0 fire-resistant ABS+PC casing and corrosion-resistant M8 terminals.
We offer free shipping on most orders across Canada, excluding the Northwest Territories, Yukon, and Nunavut. Orders are typically processed within 1–2 business days and delivered within 2–5 business days. In rare cases where shipping costs exceed standard rates, we may contact you to discuss additional charges or order adjustments. Once your order ships, you will receive a tracking number by email to monitor delivery progress. Please note that delivery times are estimates and may be affected by factors beyond our control, such as carrier delays, weather conditions, or other unforeseen circumstances. For complete details, please visit:
Shipping Policy.
Our batteries come with a 5-year warranty, which can be extended to 7 years total upon product registration. Accessories are covered by a 1-year warranty, and like-new (refurbished) batteries include a 1-year warranty.
For full terms, conditions, and claim details, please visit:
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Fast, Free Shipping
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In this review, the creator tests the Watt Cycle 12.8V 628Ah LiFePO4 battery, highlighting its extremely large capacity—over 8,000Wh of energy storage, which sets a new record for the 12V category. During testing, the battery actually delivered669Ah (106.5% of its rated capacity)at a 60A discharge rate. Internally, it uses solid aluminum busbars and multiple temperature sensors for safety monitoring. A high-current test reached about 257–258A discharge, where the BMS successfully protected the battery by shutting down when MOSFET temperatures approached 140°F, demonstrating effective thermal protection. The battery also passed low-temperature charging protection tests, stopping charge quickly when the sensor was cooled. Overall, the reviewer concludes that the battery uses high-quality cells, a capable BMS with Bluetooth monitoring, and excellent capacity.”
Tech Specs
| Dimensions | 18.9 X 14.25 X 9.53 inch | 480 X 362 X 242 mm |
| Weight | 139 lbs | 63 kg |
| Standard/Maximum Continuous Charging | 125.6A/300A |
| Maximum Continuous Discharging | 300A |
| Over-current Discharge Protection | 310A±10A |
| Over-current Charge Protection | 310A±10A |
| Primary Protection Current Value | 500A@20s |
| Secondary Protection Current Value | 1000A@5s |
| Short-Circuir Current Protection | Support |
| Release Condition | Cut Load |
| Charging High Temperature Protection | 140°F~158°F / 60°C~70°C |
| Discharge High Temperature Protection | 149°F~167°F / 65°C~75°C |
| High Temperature Protection Release Condition | Drop by 41°F~59°F / 5°C~15°C |
| Charging Low Temperature Protection | 23°F~41°F / -5°C~5°C |
| Discharge Low Temperature Protection | -13°F~5°F / -25°C~-15°C |
| Low Temperature Protection Release Condition | Rise by 41°F~59°F / 5°C~15°C |
| Rated Voltage | 12.8V |
| Standard Charging Voltage | 14.6V±0.2V |
| Shipping Charging Voltage | 12.8V~13.5V |
| Shipping Capacity | 50% |
| Cycle Life | 6000@80%DOD |
| Self Discharge Rate | <3%/Month |
| Series & Parallel Connections | 4 Parrallel(Max) 4 Series(Max) |
| Communications | Not Supported |
| Case Material | Metal |
| Storage Temperature | 32°F~140°F/0°C~60°C |
| Terminal Bolt Size | M8 |
