Powerwin BT5120 12.8V 5120Wh LiFePO4 Battery 4000 Cycles Built-in BMS

The Powerwin BT5120 is a 51.2V 100Ah LiFePO4 battery with 5,120Wh of capacity, a built-in BMS, and 4,000+ cycle life at $1,189. Built for solar storage, off-grid systems, marine applications, and whole-home backup — this is serious energy storage for serious preparedness.

• 5,120Wh / 100Ah LiFePO4 capacity — enough stored energy to run a refrigerator for days, power critical medical equipment, or keep lights and communications running through extended outages without grid dependency
• 4,000+ cycle life at 80% DoD — LiFePO4 chemistry outlasts lead-acid batteries by 8-10x; at one cycle per day, this battery lasts over 10 years before reaching 80% capacity retention
• Built-in Battery Management System (BMS) — actively protects against overcharge, over-discharge, short circuit, and over-temperature; eliminates the need for external protection hardware and safeguards your connected equipment
• 50A continuous discharge / 100A peak (5s) — handles high-draw loads including inverters, power tools, and motor-start surges; peak discharge handles startup spikes without tripping protection
• Parallel expandable — connect multiple BT5120 units in parallel to scale capacity for larger solar arrays, whole-home backup, or commercial energy systems without complex wiring
• Wide operating temperature range — charges from 0°C to 50°C and discharges from -20°C to 60°C; reliable in cold storage, outdoor enclosures, marine environments, and desert installations
• M8 connector standard — compatible with most solar charge controllers, inverters, and off-grid system components; no proprietary connectors or adapters required
• Compact form factor — 52 × 27 × 22.1 cm at 39 kg; rack-mountable or floor-standing for flexible installation in utility rooms, garages, or off-grid cabins

Specifications