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I'm impressed by the specifications of the newest capacitors. They are sold in the form factor of a D cell battery for at little as $8 each. I have no question. I'm just amazed at how fast that technology is improving. It may be time to consider applications for capacitors that we pooh-poohed before as unrealistic.
Capacitor versus lead-acid battery
Energy density 6 Wh/kg versus 33-42 Wh/kg.
Power density 4600 W/kg versus 180 W/kg.
Cycles 500000 versus 500.
Leakage 0.3 mA versus 3-20%/month self-dischargea
Here are some specs quoted for the capacitors.
Capacitor versus lead-acid battery
Energy density 6 Wh/kg versus 33-42 Wh/kg.
Power density 4600 W/kg versus 180 W/kg.
Cycles 500000 versus 500.
Leakage 0.3 mA versus 3-20%/month self-dischargea
Here are some specs quoted for the capacitors.
- Brand:MaxWell33-42
- Rated Voltage:2.7V
- Rated Capacitance:350F
- Capacitance Tolerance:0%~10%
- ESR(DC):3.2mΩ
- Maximum Continuous Current (at 15℃):35A
- Maximum Peak Current:220A
- Maximum Leakage Current (72hrs/mA):0.3mA
- Power Density (W/kg):4600
- Maximum Energy (Wh):0.35
- Energy Density (Wh/kg):5.9
- Operating Temperature range:-40℃~65℃
- Storage Temperature range:-40℃~65℃
- Weight (g):63.3
- Size (ΦD×L/mm):33.3×61.5
- Cycle Life:≥500000