Li-Ion, LiFePO4, NiMH or Lead - which battery?
Li-Ion, LiFePO4, NiMH and lead-acid differ sharply in energy density, service life, temperature behaviour and safety. This guide compares the four battery chemistries using concrete figures to help you pick the right one for industrial use.
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Which battery chemistries are on the table?
Four chemistries compete for industrial use: classic Li-Ion (NMC/NCA), the more rugged LiFePO4 (LFP), NiMH as a low-maintenance nickel chemistry and the proven lead-acid battery (Pb, AGM or gel). Each has its own profile of energy density, cell voltage and cost.
Li-Ion and LiFePO4 dominate where weight and cycle count matter. NiMH stays relevant for swappable packs and moderate currents because it uses no flammable electrolyte. Lead remains common in stationary buffer and UPS applications thanks to its low price and simple charging.
Matching charging technology and power supply for every chemistry.
Read the guideHow do the chemistries compare on energy and cycles?
Energy density drives weight and volume, cycle count drives service life. Li-Ion leads on energy density, LiFePO4 on the number of charge cycles and on robustness.
- Li-Ion: highest energy density, ideal for mobile devices and light drives.
- LiFePO4: up to 6000 cycles and a flat discharge curve, first choice for continuous duty.
- NiMH: good for swappable packs and temperature swings, but higher self-discharge.
- Lead: cheap and recyclable, yet heavy and limited in cycle count.
How do they behave with temperature and faults?
In industry, temperature behaviour and safety often matter more than the last percent of energy density. LiFePO4 is the most thermally stable lithium chemistry: thermal runaway starts only around 270 °C, whereas NMC cells become critical from roughly 150‑210 °C.
- LiFePO4: lowest fire risk, ideal for indoor and ESD workstations.
- NiMH and lead: no flammable electrolyte, but lead releases hydrogen on charge (ventilate).
- All lithium cells: observe UN 38.3 and ADR transport rules.
Which technology fits which application?
Selection follows the load profile: high cycle count and long life favour LiFePO4, minimum weight favours Li-Ion, easy swapping favours NiMH and low upfront cost favours lead.
- Portable meters and hand tools: Li-Ion for low weight.
- UPS, solar storage, automated guided vehicles: LiFePO4 for cycles and safety.
- Swappable pack systems and emergency lighting: NiMH for robustness without a BMS.
- Stationary buffering and short-term backup: lead-AGM for price.
Frequently asked questions
Is LiFePO4 really safer than classic Li-Ion?
Yes. LFP chemistry is more thermally stable; thermal runaway begins around 270 °C instead of roughly 150‑210 °C for NMC. It also releases almost no oxygen in a fault, which lowers the fire risk.
Why does LiFePO4 last longer than lead?
LiFePO4 reaches 2000 to 6000 full cycles, lead-AGM only 200 to 500. LiFePO4 also tolerates deep discharge better, whereas lead ages quickly under frequent deep discharge.
Can I charge lithium batteries in freezing cold?
No, not below 0 °C. Charging in the cold causes metallic lithium to plate onto the anode, reducing capacity and promoting short circuits. Discharging is possible down to about -20 °C.
Does every lithium battery need a BMS?
Yes. A battery management system monitors cell voltages, temperature and current, balances the cells and protects against over- and deep discharge. Lithium batteries cannot be operated safely without one.
Looking for the right battery technology?
We advise on Li-Ion, LiFePO4, NiMH and lead-acid, including matching chargers and power supplies for your industrial application.
Safely engineered
Lithium systems with tested BMS and cell balancing.
Long service life
LiFePO4 with up to 6000 cycles in continuous duty.
Temperature proof
Chemistries chosen correctly for -20 to +60 °C.
Expert advice
Specialists help with chemistry and charging.