Lion Energy UT-3500 BT-H LiFePO₄ Battery
High-Capacity Lithium Power With Built-In Heating + Bluetooth Monitoring
The Lion Energy UT-3500 BT-H is a high-performance 12V LiFePO₄ battery engineered for large power demands, deep cycling, and cold-climate operation. With 280Ah of usable capacity, a long-life prismatic cell structure, a fully automatic internal heater, and Bluetooth® monitoring, this battery delivers nearly three times the power of a standard UT-1300 BT-H while maintaining an efficient, compact footprint.
Built for RVs, marine systems, off-grid homes, solar banks, mobile power trailers, and commercial equipment, the UT-3500 BT-H provides exceptional cycle life, fast charge rates up to 140A, and stable high-output power even in harsh weather.
Key Features
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280Ah / 3,584Wh LiFePO₄ capacity
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Nearly 3× more power than a UT-1300 BT-H
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150A continuous discharge with 280A peak (50 sec)
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Internal heating system: auto-heats below 32°F, off at 41°F
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Bluetooth® monitoring—track voltage, SOC, temperature, and BMS status
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Fast charging up to 140A
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Long cycle life with premium prismatic cells
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Rugged, high-compression design for durability and safety
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Compact footprint at 72.31 lbs
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Limited lifetime warranty
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Certified: FCC, UL 1642, CE, RoHS
NOTICE: This item ships via freight and must be purchased separately. Additional freight charges apply at checkout.
Technical Specifications
| Specification |
Details |
| Chemistry |
Lithium Iron Phosphate (LiFePO₄) |
| Nominal Voltage |
12.8V |
| Rated Capacity |
280Ah (3,584Wh) |
| Minimum Capacity |
≥266Ah |
| Internal Resistance |
≤2mΩ |
| Standard Charging Current |
45A |
| Max Charging Current |
140A |
| Max Charging Voltage |
14.6V |
| Continuous Discharge |
150A |
| Peak Discharge |
280A (50 seconds) |
| Low-Voltage Cutoff |
10.5V |
| Charge Temperature |
32°F to 113°F |
| Discharge Temperature |
−4°F to 131°F |
| Storage Temperature |
14–95°F (45–85% RH) |
| Weight |
72.31 lbs |
| Dimensions |
13.85″ × 7.64″ × 12.85″ |
| LED Indicators |
1–5 LEDs show SOC from 10%–100% |
| Bluetooth® Monitoring |
Yes (myapp.lionenergy.com) |
| Internal Heater |
Auto-heat at <32°F, off at 41°F |
| Series/Parallel Support |
12V–48V (series), 280Ah–1120Ah (parallel) |
| Recommended Eyelets |
3/8″ |
Minimum Order
A minimum purchase of 16 UT-3500 BT-H batteries is required for this bulk listing. Batteries ship via palletized freight and must be ordered separately from non-freight items. If you want more email : info@kinggenerators.com
Cold-Weather Operation
The self-heating system allows safe charging in freezing conditions:
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Automatically turns on when battery is <32°F
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Heats until internal temperature reaches 41°F
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Requires a live charging current to activate
Ideal for winter RVing, off-grid cabins, utility trailers, and northern climates.
Configurable System Designs
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Series: 12V → 24V → 36V → 48V
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Parallel: Up to 4× (280Ah → 1120Ah)
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Series-Parallel: For high-voltage, high-capacity banks
All batteries must be equally charged prior to linking.
Perfect For
High-demand RVs • Solar banks • Marine systems • Off-grid homes • Skoolies • Utility trailers • Commercial energy storage • Overland rigs
