Step into a new era of portable power with WattCycle’s 12V 628Ah Ultra Lithium Battery—the very first single-unit LiFePO4 pack to deliver over 8 kWh of usable energy. That’s twice the capacity of our popular 12V 314Ah MINI BT battery, all in the same compact footprint you trust. No other brand brings you this level of energy storage in a standalone 12 V battery, making WattCycle the exclusive source for serious off-grid and mobile APP.
Core Benefits at a Glance
1. Light as a Feather
At just 154 lbs, it delivers three times the energy to weight of traditional lead-acid batteries, making setup and handling a breeze.
2. Massive Energy in a Compact Footprint
Store over 8 kWh in an 18.9 × 14.25 × 9.53 in chassis—enough juice for days on the road or weeks off-grid without hogging precious space.
3. Ultra-Flexible Over-current Protection
Default charge cutoff sits at 310+10 A but you can dial it up to 500 A for 20 seconds via the WattCycle APP. Discharge thresholds (1st: 310+10 A, 2nd: 350+10 A) and ≥ 1,800 A short-circuit guard keep your system safe under any load.
4. Long-Lasting Performance
Engineered for 6,000+ cycles at 80% DoD, this battery delivers reliable power year after year—outliving standard LiFePO4 packs by 2–3×.
5. High-Power Delivery for Heavy Loads
With a continuous 300 A discharge (3,840 W), it effortlessly drives inverters, welders, air conditioners, and industrial equipment.
6. Smart, APP-Based Monitoring
Keep tabs on voltage, state of charge, temperature, and BMS alerts in real time—right from your phone, wherever you roam.
7. Rock-Solid Safety and Durability
Armed with 8 layers of BMS protections and housed in a UL94 V-0 fire-resistant enclosure with corrosion-resistant terminals, this pack stands up to shock, vibration, and harsh environments.
8. Hassle-Free & Eco-Friendly
Forget watering or checking acid levels—this pack runs maintenance-free and is 100% recyclable when it finally reaches retirement.
Technical Specifications
Dimensions & Weight
18.9 × 14.25 × 9.53 in | 153.99 lbs
Capacity & Energy
628 Ah at 12.8 V (~8.04 kWh)
Continuous Discharge
300 A (3,840 W)
Cycle Lifespan
3,000+ cycles at 100% DoD, 6,000+ cycles at 80% DoD, 15,000+ cycles at 60% DoD.
Operating Temperature
- Charge: –5 °C to 60 °C (23 °F to 140 °F)
- Discharge: –25 °C to 75 °C (–13 °F to 167 °F)
BMS Safeguards
Integrated cell balancing, thermal monitoring, and low/high-temperature cut-offs, alongside the above over-current protections
Scalability
Supports up to 4-series (51.2 V) or 4-parallel (2,512 Ah) configurations for a maximum of 128.6 kWh usable energy
Build Quality
UL94 V-0 fire-resistant ABS+PC casing with corrosion-resistant M8 terminals
In-Depth Feature Spotlight
Adaptive Over-current Control
Thanks to our intelligent BMS over-current protection, you can dial in both charge and discharge limits right in the WattCycle APP. The default charge cutoff sits at 310 A + 10 A tolerance, but you can boost it to 500 A for up to 20 seconds—perfect for rapid topping-off after a long day off-grid. On the discharge side, a two-stage cutoff (310 A then 350 A) and ≥ 1,800 A short-circuit guard keep your inverter and equipment safe under any load profile.
High-Power Output
When your rig demands serious current, this pack answers with a continuous 300 A (3,840 W) discharge capacity. That’s enough to run heavy-duty inverters, air conditioners, welders, or industrial machinery without a hiccup, so you can tackle high-draw applications confidently.
Smart Bluetooth Monitoring
Stay connected to your battery’s health no matter how far you roam. Real-time updates on voltage, state of charge, temperature, and BMS alerts appear directly in the WattCycle APP, complete with custom notifications that let you spot issues before they become problems.
Safety & Durability You Can Trust
When you depend on your battery in extreme conditions, every layer of protection counts. The WattCycle 12V 628Ah pack delivers eight distinct safeguards:
1. Over-Charge Cut-Off
Automatically disconnects charging when cell voltage reaches its upper safe limit to prevent over-voltage stress.
2. Over-Discharge Cut-Off
Stops output when cell voltage drops to its lower safe threshold, avoiding deep-discharge damage.
3. First-Stage Over-Current Protection
Limits discharge current to 310 A + 10 A tolerance, guarding against moderate overloads.
4. Second-Stage Over-Current Protection
Adds a tougher cutoff at 350 A + 10 A for extreme loads, with rapid fault response.
5. Customizable Charge Over-Current
Default 310 A + 10 A charge cutoff, user settable up to 500 A for 20 seconds via the WattCycle APP for high speed recharge.
6. High-/Low-Temperature Cut-Offs
Internal sensors shut down the pack below –25 °C or above 75 °C, preserving cell health in the coldest and hottest environments.
7. Short-Circuit Defense
Instant interruption of currents ≥ 1,800 A in microseconds to protect wiring and electronics from catastrophic faults.
8. Automatic Cell Equalization
Balances individual cell voltages after each charge cycle and continuously monitors state of charge (SoC) to prevent weak-cell drift, ensure reliable capacity reporting, and maximize overall pack lifespan.
Rugged, Military-Grade Build
- Fire-Resistant Housing: UL94 V-0 ABS+PC enclosure resists flame and prevents fire spread.
- Shock & Vibration Tolerance: Silicone mounts and structural bracing withstand 5 g shocks and 15 Hz vibration spectrums.
- Corrosion-Resistant Terminals: M8 stainless steel posts with gold plated contacts hold up to salt spray environments.
- IP65 Ingress Protection: Sealed gaskets and over molded entries block dust and splashes.
With these eight precision-engineered safeguards—including accurate SoC tracking—and a bulletproof enclosure, your WattCycle 12V 628Ah battery stands ready for the toughest adventures.
Scalable, Plug-and-Play Expansion
Whether you need more voltage or more capacity, the WattCycle 12V 628Ah battery grows with your ambitions:
4-Series Configuration (51.2V)
Stack four units end-to-end to power higher voltage inverters and industrial systems. No custom wiring harnesses—just plug each battery into the next using our keyed Anderson connectors, and you’re ready to go.
4-Parallel Configuration (2,512Ah / 32kWh)
Link four batteries side-by-side to build a massive, low-voltage bank that delivers nearly 32kWh of usable energy. Ideal for off-grid cabins or larger backup installations, this layout keeps your pack at 12.8V for maximum compatibility with RV and marine gear.
Simple Daisy Chain Wiring
Each unit comes with heavy duty, color coded cables and lock in terminals. No need for electricians or special tools—your system is live as soon as you click the connectors together.
With plug-and-play scalability up to 128.6kWh (4 × 4) total energy, you can tailor your setup on the fly—whether you’re expanding a solar array next season or upgrading your mobile rig before departure.
Real-World Applications
RVs & Adventure Rigs
Mounting the WattCycle 12V 628Ah battery in your motorhome or overland trailer slashes pack weight by two-thirds compared to a lead-acid equivalent, freeing up payload for gear and water. With 8 kWh onboard, you can run lights, fridges, and electronics for days without recharging—and use the APP to tweak over-current limits for fast topping-off when shore power’s available.
Marine Vessels
Salt spray and engine vibration are no match for this military-grade LiFePO4 pack. The corrosion-resistant terminals and vibration-damped housing keep connections solid, while the 300 A continuous discharge delivers dependable starting amps—and a temporary 500 A boost handles rapid alternator charging after a long cruise.
Off-Grid Solar Cabins
For tiny homes and remote retreats, a single WattCycle 628Ah unit supplies roughly 8 kWh of steady power—enough for lighting, pumps, and small appliances. Its low self-discharge (<3%/month) and wide temp range mean you can leave it idle through winter with zero worry, then wake up to full capacity come spring.
Commercial Backup Power
Critical loads in telecom towers, agricultural operations, and emergency-response centers demand reliability. The 6,000-cycle lifespan and modular scalability (up to 128.6 kWh) ensure uninterrupted service through grid failures, while real-time SoC and temperature alerts via Bluetooth keep your maintenance team one step ahead.
Head-to-Head Comparison
12V 628Ah vs. Two 12V 314Ah MINI BT Batteries
- Installation: One pack, one set of cables—no parallel wiring or balancing hassles.
- Footprint: Fits in the same tray you’d use for two MINI BTs, freeing up space for other gear.
- Monitoring: Single-APP interface for SoC, temperature, and customizable BMS over-current protection vs. juggling two Bluetooth profiles.
12V 628Ah vs. Lead-Acid Banks
- Weight: Roughly 154 lbs vs. 460 lbs for an equivalent 8 kWh lead-acid bank—a 66% reduction in installation effort.
- Lifespan: Delivers 6,000+ cycles at 80% DoD vs. ~500–800 cycles for lead acid, translating into decades of service.
- Cost of Ownership: Compare with lead acid battery, 10× longer lifespan and zero maintenance cuts total cost over time.
Getting Started
Download the Detailed Spec Sheet
Access all dimensions, electrical specifications, and application notes in one convenient PDF for your engineering review or procurement process.
Try Our Sizing Guide & APP Tutorial
Use our interactive online calculator to configure the perfect bank size, and watch a brief walk through of the WattCycle APP’s monitoring and over-current setup features.
Reach Out for Custom System Support
Planning an RV install, off-grid cabin, or critical backup solution? Our team can provide wiring diagrams, load analyses, and turnkey recommendations—just drop us a line.
Ready to take the next step? Visit the product page or contact us today!
