Product Description
Group U1 LiFePO4 Battery
The VMAX LFP1250M is a 12V 50Ah LiFePO4 Group U1 deep-cycle lithium battery designed for marine, off-grid solar, and energy-storage systems that need lasting, dependable power. A built-in Battery Management System protects against over-voltage, under-voltage, over-current, short circuit, and temperature extremes for safe, maintenance-free service. At only 10 pounds with a sealed IP67 waterproof case, it drops into many AGM or flooded Group U1 trays while cutting weight by more than half. Fast lithium charging, strong continuous output for inverters and DC loads, and series or parallel expansion make this compact pack an easy upgrade for boats, solar banks, mobility equipment, and backup power.
Features & Benefits
- IP67 Waterproof Rating – Sealed case resists rain, spray, and wet marine or outdoor conditions.
- Lightweight 10 lb Design – Far easier to lift and install than a comparable Group U1 AGM or flooded battery.
- Built-In BMS Protection – Over/under-voltage, over-current, short-circuit and temperature protections.
- Compact U1 Group Size – Group U1 footprint for drop-in lithium upgrades for many VRLA and AGM applications.
- Fast, Efficient Charging – The battery is optimized for LiFePO4 smart chargers and solar charge controllers.
- High Discharge Capability – Supports inverters and DC loads with up to 60 amps continuous output.
- Scalable System Design – Connect up to 4 in series (24/36/48V), or 4 in parallel (up to 200Ah).
- 7-Year Warranty – Backed by VMAX's industry leading customer service.
Why Choose VMAX Lithium Batteries?
The VMAX LFP series pairs high-grade LiFePO4 cells with an advanced Battery Management System (BMS) to deliver stable, maintenance-free deep-cycle power—year after year. The standardized group sizes simplify drop-in lithium upgrades where AGM or flooded batteries were previously used. With fast charging, high discharge capability and support for series & parallel banks, they scale easily from a single battery devices to multi-battery energy storage banks. Backed by a 7-Year Warranty and a 10-year design life for reliable power and excellent long-term value.
LFP1250M
VMAX LFP1250M Specifications
12.8V 50Ah LiFePO4 Deep-Cycle Battery
- Nominal Voltage 12.8V
- Chemistry Lithium (LiFePO4)
- Capacity 50Ah / 640Wh
- Max Continuous Discharge 60A
| Electrical & Performance | |
|---|---|
| Chemistry | Lithium (LiFePO4) |
| Nominal Voltage | 12.8 Volts |
| Rated Capacity | 50Ah / 640Wh |
| Max Continuous Discharge |
60 Amps |
| Max 3 Second Discharge |
120 Amps |
| Low Voltage Cut-Off | 9.2V |
| Series Connections | Up to 4 (48V) |
| Parallel Connections | Up to 4 (200Ah) |
| Operating Temperature |
-4°F - 150°F (-20°C - 65°C) |
| Charging | |
| Charging Voltage | 14.4V |
| Max Charge Current | 5A - 25A |
| Charging Temperature |
32°F - 113°F (0°C - 45°C) |
| Dimensions & Fitment | |
| Group Size | U1 |
| Length | 7.70" (194 mm) |
| Width | 5.10" (132 mm) |
| Height | 6.7" (170 mm) |
| Terminals | M6 Inserts (hardware included) |
| Polarity | + Left / - Right |
| Weight | 10.0 lbs (4.75 kg) |
| Certifications & Warranty | |
| Design Life | ~10 Years |
| Cycle Life | ~3500 cycles @ 100% DOD |
| Certifications | IP67, UN 38.3, CE |
| Warranty | 7 Years |
Charging note: Requires a dedicated LiFePO4-compatible charger for optimal performance and safety. Recommended bulk/absorb charge voltage is 14.4V - 14.6V. Do not use traditional lead-acid chargers featuring automatic desulfation or equalization modes.
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VMAX LFP1250M Battery Cross-Reference
View DetailsHide DetailsGroup U1 Batteries with M5/M6 Insert Terminals: CB12350-IT, CBEV-U1-IT, CP12350I, CT1050, DCM0035, DURA12-35C, ES35-12FT, GP12350I, LC-XD1235PI, LCR12V35PI, LFP1250B, LFP1250M, MU-1 SLD M FT, MU-1 SLD M-33-FT, ML35-12INT, NP35-12I, PE12V35I, PK12350I, PS-12350 B, PS12350I, SCP12350 M6, SLA12-35I, SLAA12-35C, UB12350I, UB12350 TH, V35-857.
Group U1 Batteries with Nut & Bolt Terminals: 12N35-3B, 12V32-U1, 15020225, 1726-M8AU1, 50141, 6FM33, 8226, 8AU1, 8AU1H, 8GU1, 8GU1H, ABP A8AU1, AGM U1, AGMU1, AU1, AU1H, CA12350, CB-U1-AGM, CB12350-NB, CBEV-U1-NB, CP12350NB, DB8AU1, DC35-12, DCM0035NB, DURDC12-35J, DURG12-31J-A, EP V8AU1, ES33-12, ES35-12NB, ESU1, ESU1-35, ESU1H, EXP35, GP12350-NB, LCR12V35P-NB, ML35-12NB, MU-1 SLD A, MU-1 SLD G, MU-1 SLD M, MU-1 SLD M-33, NB12-35, NGU1, NP35-12NB, PDC-12350 NB3, PE12V35NB, PK12350-NB, PS-12350 NB, SCP12350 NB, SLADC12-35J, SLIAU1, SLIAU1H, SP-18, SP-30, SP-35, SP-40, U131AH, U1A-200, U1AGM, U1L-AGM-NB, U1RVS, UB12350-NB, WB1235.
Important: Always confirm your battery's dimensions, terminal configuration, and specifications before purchase to ensure proper fit and performance.
Warning: LiFePO4 charger required if upgrading from non-lithium batteries.