Alkaline (Zn-MnO2) vs. Nickel-Cadmium (NiCd)
Comparing 2 standards across 9 specifications. 9 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.
Nickel-Cadmium (NiCd) is a mature, exceptionally rugged alkaline secondary chemistry operating at 1.2V nominal. Renowned for sustaining massive pulse discharge currents, operating reliably in deep sub-zero temperatures (-40°C), and enduring harsh electrical abuse, NiCd remains in service for aircraft backup power, emergency lighting, and legacy industrial systems.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Cell Voltage
|
1.50 V | 1.20 V |
|
Gravimetric Energy Density
|
100 – 140 Wh/kg | 45 – 65 Wh/kg |
|
Volumetric Energy Density
|
250 – 350 Wh/L | 120 – 160 Wh/L |
|
Cycle Life (to 80% Capacity)
|
Single Use (Primary Non-Rechargeable) | 1,000 – 2,000 Cycles |
|
Thermal Runaway Threshold
|
> 200 °C | > 260 °C |
|
Operating Temperature Range
|
-18 to +55 °C | -40 to +60 °C |
|
Self-Discharge Rate
|
< 0.2% / Month (< 2% / Year) | 15 – 20% / Month |
|
Primary Anode Material
|
Zinc Powder (Zn) in Gel suspension | Metallic Cadmium (Cd) |
|
Primary Cathode Material
|
Manganese Dioxide (MnO2) with Graphite conductive matrix | Nickel Oxyhydroxide (NiOOH) |