The choice between Valve-Regulated Lead-Acid (VRLA) and Lithium-ion (Li-ion NMC or LFP) batteries involves several key differences:
- Lifespan: VRLA typically lasts 3-5 years at 77°F (25°C), while Li-ion offers 8-12 years.
- Temperature sensitivity: VRLA life halves for every 18°F (10°C) above 77°F; Li-ion tolerates heat better but still prefers 68-77°F.
- Energy density: Li-ion provides higher energy density, meaning more runtime in smaller space.
- Recharge time: Li-ion batteries recharge faster.
- Cost: VRLA has lower upfront cost but higher lifetime maintenance/replacement costs.
When evaluating, consider Total Cost of Ownership (TCO) rather than just purchase price. While Li-ion costs more initially, its longer lifespan and lower maintenance often make it more economical over 5-7 years in 24/7 environments.
This answer is sourced from Posts《Server rack battery backup system》