Product Description
Group U1 LiFePO4 Battery
The VMAX LFP1250B is a 12V 50Ah lithium deep cycle battery that's designed for marine, off-grid solar, and energy-storage systems that require lasting dependable power. Integrated Bluetooth battery monitoring, fast charging, and long cycle life make this a user friendly and versatile lithium upgrade. Features a built-in Battery Management System (BMS) for protections that ensure long service life. Light 10 pound design makes it a perfect drop-in lithium upgrade over heavier AGM or flooded Group U1 batteries.
Features & Benefits
- Bluetooth – Realtime monitoring of battery performance in the VMAX App.
- Built-In BMS Protection – Over/under-voltage, over-current, short-circuit and temperature protections.
- Compact U1 Group Size – Drop-in replacement for many VRLA/AGM U1 applications
- Fast, Efficient Charging – Optimized for LiFePO4 smart chargers and solar charge controllers.
- High Discharge Capability – Supports inverters and DC loads up to 50 continuous amps.
- Scalable System Design – Wire 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.
LFP1250B
VMAX LFP1250B Specifications
12.8V 50Ah LiFePO4 Deep-Cycle Battery
- Nominal Voltage 12.8V
- Capacity 50Ah / 640Wh
- Group Size U1
- Chemistry Lithium (LiFePO4)
| Electrical & Performance | |
|---|---|
| Chemistry | Lithium (LiFePO4) |
| Nominal Voltage | 12.8 Volts |
| Rated Capacity | 50Ah / 640Wh |
| Max Continuous Discharge |
50 Amps |
| Max 3 Second Discharge |
150 Amps |
| Low Voltage Cut-Off | 10.0V |
| 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 |
| Recommended Charging Current |
5A - 50A |
| Charging Temperature |
32°F - 113°F (0°C - 45°C) |
| Dimensions & Fitment | |
| Group Size | U1 |
| Length | 7.70" (196 mm) |
| Width | 5.20" (132 mm) |
| Height | 7.2" (183 mm) |
| Terminals | M6 Inserts (hardware included) |
| Polarity | - Left / + Right |
| Weight | 13.0 lbs (5.9 kg) |
| Certifications & Warranty | |
| Design Life | ~10 Years |
| Cycle Life | ~4000 cycles @ 80% DOD |
| Certifications | IP54, 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.
VMAX LFP1250M DatasheetVMAX Bluetooth Battery Monitoring
View DetailsHide DetailsView real-time battery status, performance, and enable custom alerts to be notified when your specified conditions are exceeded.
- Voltage
- Amperage In/Out
- Estimated Time to Full Charge at Current Charge Rate
- Cell Balancing Monitor
- Temperature
- Battery Status
- Battery Cycles
VMAX App Downloads
Bulk Pricing on VMAX LFP1250B Batteries + Free Shipping
View DetailsHide Details2-3 — $5.00 Off Each
4-8 — $10.00 Off Each
9+ — $15.00 Off Each
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VMAX LFP1250B 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.