Lead-Acid (AGM / Gel / Flooded) vs. Lithium-Ion (NMC)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Lead-Acid is the oldest rechargeable battery chemistry (invented 1859), delivering 2.0V per cell (12V nominal in standard 6-cell monoblocs). Despite low gravimetric energy density (30–50 Wh/kg), its unmatched surge current delivery (hundreds of cold cranking amps), low production cost, and 99% recycling rate make it the universal standard for automotive starting/ignition (SLI) and industrial UPS systems.
Lithium Nickel Manganese Cobalt Oxide (LiNiMnCoO2 / NMC) is the primary workhorse chemistry of electric vehicles, power tools, and high-performance electronics. Operating at 3.6V–3.7V nominal with a 4.2V charge cutoff, NMC provides a balanced compromise between high gravimetric energy density (200–260 Wh/kg), robust thermal stability, and low internal resistance.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Cell Voltage
|
2.00 (12.00 V 6-Cell Pack) V | 3.60 – 3.70 V |
|
Gravimetric Energy Density
|
30 – 50 Wh/kg | 200 – 260 Wh/kg |
|
Volumetric Energy Density
|
60 – 100 Wh/L | 550 – 700 Wh/L |
|
Cycle Life (to 80% Capacity)
|
300 – 1,000 (Deep Cycle AGM) Cycles | 1,000 – 2,000 Cycles |
|
Thermal Runaway Threshold
|
> 200 °C | ~210 °C |
|
Operating Temperature Range
|
-20 to +50 °C | -20 to +55 °C |
|
Self-Discharge Rate
|
3 – 5% / Month | 1 – 2% / Month |
|
Primary Anode Material
|
Porous Sponge Lead (Pb) | Synthetic / Natural Graphite |
|
Primary Cathode Material
|
Lead Dioxide (PbO2) in Sulfuric Acid Electrolyte (H2SO4) | LiNiMnCoO2 (NMC 532, 622, or 811) |