BSLBATT 12V 50Ah LiFePO4 Battery – Deep-Cycle SLA/AGM Replacement for Solar, UPS & Mobility (B-LiFePO4-12-50)

The BSLBATT 12V 50Ah is a deep-cycle lithium iron phosphate (LiFePO4) battery built as a direct, plug-and-play replacement for 12V 50–55Ah sealed lead-acid (SLA), AGM, and gel batteries. A built-in 100A Battery Management System (BMS) with premium-grade cells protects against overcharge, over-discharge, short circuit, and temperature extremes — delivering far more usable power at roughly half the weight.

Why upgrade from lead-acid?

• About 60% lighter — ~11.5 lbs vs ~30+ lbs for an equivalent SLA.
• Up to 10× longer life — 3,500+ cycles at 80% depth of discharge, vs ~300–500 for lead-acid.
• More usable capacity and a flat voltage curve — runs at full power until nearly empty.
• 100% maintenance-free and safe in non-ventilated boxes; expandable up to 4S/4P (build to 48V or 200Ah).

Common uses

Solar and off-grid storage, UPS / battery backup, mobility scooters and wheelchairs, RV/marine house power, alarm and security systems, and general 12V deep-cycle applications.

Specifications

• Nominal: 12.8V, 50Ah, 640Wh
• Dimensions: 7.80 × 6.50 × 6.89 in (198 × 165 × 175 mm) — Group U1 footprint
• Weight: ~11.5 lbs (5.2 kg)
• Built-in 100A BMS; max continuous discharge 50A
• Cycle life: ≥3,500 @ 80% DOD
• Operating temp (discharge): −20 to 60°C
• Certifications: UL 1973 / UL 9540A / UN38.3
• Warranty: 5 years

Replacing a lead-acid battery? Match the voltage (12V) and confirm the case size and terminals fit. Browse our full LiFePO4 range or read LiFePO4 vs Lead-Acid: Why Lithium Iron Phosphate Is the Upgrade.