Alkaline (Zn-MnO2) vs. Lead-Acid (AGM / Gel / Flooded)
Comparing 2 standards across 9 specifications. 8 key differences identified.
Alkaline (Zinc-Manganese Dioxide) is the worldwide standard primary (non-rechargeable) chemistry for consumer electronic cells (AA, AAA, C, D, 9V). Operating at 1.5V nominal, alkaline batteries utilize a potassium hydroxide (KOH) alkaline electrolyte, offering 100–140 Wh/kg energy density, a 5-to-10 year shelf life, and low environmental toxicity.
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.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Cell Voltage
|
1.50 V | 2.00 (12.00 V 6-Cell Pack) V |
|
Gravimetric Energy Density
|
100 – 140 Wh/kg | 30 – 50 Wh/kg |
|
Volumetric Energy Density
|
250 – 350 Wh/L | 60 – 100 Wh/L |
|
Cycle Life (to 80% Capacity)
|
Single Use (Primary Non-Rechargeable) | 300 – 1,000 (Deep Cycle AGM) Cycles |
|
Thermal Runaway Threshold
|
> 200 °C | > 200 °C |
|
Operating Temperature Range
|
-18 to +55 °C | -20 to +50 °C |
|
Self-Discharge Rate
|
< 0.2% / Month (< 2% / Year) | 3 – 5% / Month |
|
Primary Anode Material
|
Zinc Powder (Zn) in Gel suspension | Porous Sponge Lead (Pb) |
|
Primary Cathode Material
|
Manganese Dioxide (MnO2) with Graphite conductive matrix | Lead Dioxide (PbO2) in Sulfuric Acid Electrolyte (H2SO4) |