BATTERY CHEMISTRY
Tuesday, March 18th, 2008| NICAD | NiMH | SLA | Li-Ion | Li-Polymer | Reusable Alkaline | |
| Energy Density (Wh/kg) |
40-60 | 60-80 | 30 | 100 | 150-200 | 80 (initial) |
| Cycle Live (capacity decrease from 100% to 80%) |
1550 | 500 | 200-500 | 500-1000 | 100-150 | 10 (to 65%) |
| Fast charge time | 1-1h | 2-4h | 8-16h | 3-4h | 8-15h | 2-3h |
| Overcharge tolerance | moderate | low | high | very low | N/A | moderate |
| Self-discharge per month (room temperature) |
20% | 30% | 5% | 10% | N/A | 0.3% |
| Cell voltage (nominal) |
1.25V | 1.25V | 2V | 3.6V | 2.7V | 1.5V |
| Load current | > 2c | 0.5-1C | 0.2C | 1C or less | 0.2C | 0.2C |
| Operating Temperature | 040 to +60 C | -20 to +60 C | -20 to +60 C | -20 to +60 C | N/A | 0 to +65 C |
| Maintenance requirement (to obtain max. service live) |
30 days | 90 days | 3 - 6 months | not req. | not req. | not req. |
| Typical Battery Cost (Cost by US prices) |
$50.00 | $70.00 | $25.00 | $100.00 | $90.00 | $5.00 |
| In commercial use since | 1950 | 1990 | 1970 | 1997 | Not released | 1992 |