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Table 1 Nominal parameters for 1 Amphour secondary batteries

From: Frontier battery development for hybrid vehicles

  Lead acid Nickel metal hydride Lithium ion
Specific energy 20-35 Wh/kg ~65 Wh/kg 90 Wh/kg
Energy density 54-95 Wh/L ~150 Wh/L 153 Wh/L
Specific power ~250 W/kg 200 W/kg 300 W/kg
Nominal cell voltage 2 V 1.2 V 3.5 V
Internal resistance ~.022Ω per cell ~.06Ω per cell ~.2Ω per cell
Self-discharge ~2% a day ~5% a day ~10% a month
Recharge time 8h (90% in 1h possible) 1h (60% in 20min possible) 2-3h
  1. Larminie (2003)