Description
When you need a compact, reliable lithium battery that punches above its weight for marine, RV, solar, and off-grid applications, the Epoch 1250A-ES delivers 50Ah of stable LiFePO4 chemistry with built-in Bluetooth monitoring and an 11-year warranty that backs every cycle.
- 4,000+ Cycle LiFePO4 Chemistry – Stable lithium iron phosphate chemistry delivers over 4,000 maintenance-free cycles, dramatically outlasting AGM and lead-acid alternatives in deep cycle applications.
- Built-In Bluetooth Monitoring – Connects to iOS and Android apps for real-time battery management, state of charge visibility, and system diagnostics right from your phone.
- 170A Peak Output with Advanced BMS – Delivers 170A peak power for 3 seconds with a smart BMS that protects against overcharge, over-discharge, over-current, short circuit, and high/low temperature disconnect.
- IP54 Weather Resistant Enclosure – Dust-protected and splash-resistant compact Essential case handles the real-world conditions of marine, RV, and outdoor off-grid installations without compromise.
- Scalable Series and Parallel Expansion – Connect up to 4 units in series for 48V configurations or up to 4 in parallel for expanded capacity, giving you a flexible foundation for any system build.
The 1250A-ES is built on stable LiFePO4 chemistry the safest lithium chemistry available making it a drop-in upgrade from AGM or lead-acid in virtually any 12V deep cycle application. At just 14.3 lbs in a compact 7.7 x 6.5 x 6.9 in footprint, it delivers exceptional energy density for its size without adding unnecessary weight to your boat, RV, or solar bank.
The integrated smart BMS handles all protection functions automatically no external BMS required, no manual balancing, and no maintenance beyond keeping your charger settings dialed in. Bulk and absorption charge at 14.2–14.6V and float at 13.4–13.8V, compatible with any lithium-compatible charger, inverter-charger, DC-to-DC charger, or solar controller.
Backed by US-based Epoch technical support and an 11-year manufacturer warranty, this is the kind of battery you install once and forget about letting it quietly deliver reliable power for years while you focus on everything else.
Technical Specification
| Specification | Epoch 1250A-ES |
|---|---|
| Model | 1250A-ES |
| Series | Essential Series |
| Chemistry | LiFePO4 |
| Nominal Voltage | 12.8 V |
| Voltage Class | 12 V |
| Capacity | 50 Ah |
| Energy Stored | 0.64 kWh |
| Operating Range | 10.0 – 14.6 V |
| Max Charge Voltage | 14.6 V |
| Max Continuous Charge Current | 50 A |
| Max Continuous Discharge Current | 50 A |
| Peak Discharge (3 sec) | 170 A |
| Bulk / Absorption Voltage | 14.2 – 14.6 V |
| Float Voltage | 13.4 – 13.8 V |
| Cycle Life | 4,000+ Cycles |
| Cell Configuration | 4S |
| Series Configuration | Max 4 in Series (up to 48V) |
| Parallel Configuration | Max 4 in Parallel |
| Discharge Temperature | -20°C to 60°C (-4°F to 140°F) |
| Charge Temperature | 0°C to 55°C (32°F to 131°F) |
| Storage Temperature | 0°C to 35°C (32°F to 95°F) |
| Self-Heating | No |
| Dimensions (L x W x H) | 7.7 x 6.5 x 6.9 in |
| Weight | 14.3 lbs (6.5 kg) |
| Case Style | Compact Essential Case |
| Terminals | Bolt Terminals |
| IP Rating | IP54 |
| Bluetooth | iOS / Android Apps |
| BMS Protection | Overcharge, Over-discharge, Over-current, Short Circuit, High/Low Temp |
| Compliance | CE, RoHS, UN38.3 |
| Maintenance | Maintenance-Free |
| Warranty | 11 Years |
Specs & Info