The battery is the most expensive part of most backup systems to replace. Choosing the right type matters.
Comparison
| LiFePO4 lithium | Lead-acid | |
|---|---|---|
| Upfront price | Higher | Lower |
| Cycle life | Many more cycles | Fewer cycles |
| Usable capacity | Most of its rating | Should not be drained deeply |
| Maintenance | Very little | Some types need topping up |
| Weight | Lighter | Heavier |
Why lithium often costs less over time
A lithium battery lasts many more charge cycles and lets you use more of its capacity, so the cost per cycle is usually lower despite the higher price.
When lead-acid makes sense
- Very tight upfront budget.
- Backup used only occasionally.
Check before buying
- Battery voltage matches your inverter.
- A good battery management system (BMS) on lithium batteries.
- Warranty terms.
See lithium battery storage and our solar beginner's guide.
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Published October 10, 2026 · 1 min read