LiFePO4 vs Lead-Acid Batteries: 2026 Comparison Chart
If you are sizing a solar, RV, or backup bank in 2026, the LiFePO4-vs-lead-acid decision comes down to lifetime cost, weight, and how much of the rated capacity you can actually use. The table below puts the real numbers side by side, followed by typical size and weight figures and a few of our own rated specs.
Head-to-head specification comparison
| Specification | LiFePO4 (LFP) | Lead-Acid (Flooded) | Lead-Acid (AGM/Gel) |
|---|---|---|---|
| Cycle life @ 80% DoD | 3,000–6,000 | 300–500 | 500–1,000 |
| Usable depth of discharge | 80–100% | 50% | 50–80% |
| Round-trip efficiency | 95–98% | 70–85% | 80–90% |
| Energy density (Wh/kg) | 90–160 | 30–50 | 30–50 |
| Typical weight per kWh | ~7–10 kg | ~20–30 kg | ~20–30 kg |
| Maintenance | None | Watering, equalizing | Minimal |
| Charge below 0°C | Needs low-temp cut-off | Very poor | Very poor |
| Ventilation | Not required | Hydrogen venting required | Low gassing |
| Upfront cost per kWh (pack) | Higher | Lower | Mid |
| Lifetime cost per kWh | Lower | Higher | Higher |
Figures are industry-general ranges for stationary and mobile energy storage as of 2026, not a quote for any single product.
Typical size and weight by usable capacity
These are representative dimensions for a single LiFePO4 module at common home and off-grid sizes. Actual numbers vary by case material and BMS layout, so always confirm against the datasheet before designing an enclosure.
| Usable capacity | Typical weight | Typical footprint (W×D×H) | Common use |
|---|---|---|---|
| 5 kWh (51.2V 100Ah) | ~42–50 kg | ~440×150×550 mm | Apartment / small cabin |
| 10 kWh (51.2V 200Ah) | ~85–100 kg | ~650×150×550 mm | Home daily cycling |
| 15 kWh (rack, 3×5kWh) | ~130–150 kg | ~440×450×1300 mm | Whole-home backup |
| 48V 100Ah portable | ~40–55 kg | Wheeled case | Events / mobile |
Real rated specs from our LiFePO4 line
As a concrete reference, our 5 kWh wall-mounted module is rated 51.2V / 100Ah, 5.12 kWh usable, a 100A continuous discharge, 6,000-cycle design life, IP21 indoor rating, and CE / UN38.3 / IEC / RoHS certification with CAN / RS485 communication. A 10 kWh wall unit doubles the capacity to 200Ah. See the wall-mounted product line for the full breakdown.
When LiFePO4 wins, and when lead-acid still makes sense
Choose LiFePO4 when you cycle the bank daily (off-grid solar, RV, daily peak-shaving), care about weight, or want a 10-year service life without watering. Lead-acid still fits infrequent backup, tight upfront budgets where weight and cycle life do not matter, or systems where the existing charger cannot be reconfigured.
For US buyers, confirm the listing marks before purchase — our UL & cETL guideexplains what UL 9540A, UL 1973 and UL 1741 actually cover.
Frequently asked questions
How many cycles does a LiFePO4 battery last compared to lead-acid?
A quality LiFePO4 cell rated at 80% depth of discharge typically delivers 3,000–6,000 cycles. A flooded lead-acid bank lasts 300–500 cycles to the same 80% DoD (you normally only use 50% of its capacity, so its "real" cycle count looks higher on paper but delivers far less usable energy). AGM sits between the two at roughly 500–1,000 cycles.
Why is LiFePO4 lighter than lead-acid for the same energy?
LiFePO4 stores about 90–160 Wh/kg versus 30–50 Wh/kg for lead-acid. For the same usable kWh, a LiFePO4 pack weighs roughly one third of a lead-acid bank. In a 10 kWh home system that is the difference between ~100 kg and ~300 kg.
Is LiFePO4 cheaper than lead-acid over its lifetime?
Upfront, LiFePO4 costs more per kWh of pack capacity. Over the full service life it is usually cheaper because you replace it far less often and lose less energy to inefficiency. A lead-acid bank that needs 3–5 replacements to match one LiFePO4 pack erases its lower sticker price.
Can LiFePO4 replace my existing lead-acid batteries directly?
Electrically yes for voltage-matched systems (12V/24V/48V), but you must check the charger and solar charge controller settings. Lead-acid needs absorption/float stages; LiFePO4 wants a constant-voltage / CV stage with tighter voltage limits and usually a low-temperature cut-off on charging. Reusing a lead-acid charger without reconfiguration can undercharge or stress the LiFePO4 pack.
Building a system? Our solar battery sizing guide walks through capacity, autonomy days and inverter matching.