|
Lead Acid |
Li-ion |
NiCd |
NiMH |
Specific Energy Density (Wh/kg) |
30-50 |
100-190 |
45-80 |
60-120 |
Life Cycle (80% capacity) |
200-300 |
500-1000 |
1000-1500 |
300-500 |
Overcharge Tolerance |
High |
very low |
Moderate |
Low |
Self-discharge / Month(room temp) |
5% |
<10% |
20% |
30% |
Charge Temperature |
-20 to 50°C |
0 to 45°C |
0 to 45°C |
0 to 45°C |
Discharge Temperature |
-20 to 50°C |
-20 to 60°C |
20 to 65°C |
20 to 65°C |
Maintenance Requirement |
3-6 Months |
not required |
30 to 60 days |
60 to 90 days |
Toxicity |
Very High |
Low |
Very High |
Low |