BSLBATT 12V 20Ah LiFePO4 Battery – Deep-Cycle SLA/AGM Replacement for Mobility, UPS & Solar (B-LiFePO4-12-20)

The BSLBATT 12V 20Ah is a deep-cycle lithium iron phosphate (LiFePO4) battery built as a direct, plug-and-play replacement for 12V 18–22Ah sealed lead-acid (SLA), AGM, and gel batteries. A built-in 50A Battery Management System (BMS) guards against overcharge, over-discharge, short circuit, and high/low temperature — so you get more usable power at a fraction of the weight.

Why upgrade from lead-acid?

• About 60% lighter — just ~4.4 lbs vs ~12+ lbs for an equivalent SLA, ideal for wheelchairs, scooters, and portable power.
• Up to 10× longer life — 1,500+ cycles at 80% depth of discharge (rated up to 5,000), vs ~300–500 for lead-acid.
• More usable capacity and a flat voltage curve — full power until nearly empty.
• 100% maintenance-free and safe in non-ventilated boxes (no acid, no off-gassing).

Common uses

Electric wheelchairs and mobility scooters, UPS / battery backup, solar and off-grid, alarm and security panels, emergency lighting, and general 12V deep-cycle applications.

Specifications

• Nominal: 12.8V, 20Ah, 256Wh
• Dimensions: 7.13 × 3.03 × 6.69 in (181 × 77 × 170 mm)
• Weight: ~4.4 lbs (2 kg)
• Terminal: M6 threaded
• Built-in 50A BMS; max continuous discharge 20A
• Cycle life: ≥1,500 @ 80% DOD (up to 5,000)
• Operating temp (discharge): −20 to 60°C
• Protection: IP54 · Certifications: UL 1973 / 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.