Lead-acid batteries are cheaper up front but heavier, larger, less energy-dense, and need more maintenance and replacement every 3–5 years. Lithium-ion batteries cost more initially but last 10–15+ years, take up less space, charge faster, support deeper discharge, and require zero maintenance — which is why nearly every modern home backup system uses lithium.
Side-by-side comparison
- Lifespan — Lead-acid 3–5 yrs; Lithium 10–15+ yrs
- Depth of discharge — Lead-acid ~50%; Lithium 90–100%
- Maintenance — Lead-acid regular checks; Lithium none
- Footprint — Lithium half the space
- Up-front cost — Lead-acid lower; Lithium higher (lower lifetime cost)
We install lithium-based Tesla Powerwall, Enphase, FranklinWH, and LG systems through home battery backup service. Pair with a smart panel for automated load management.
