Nickel–iron battery
>
The nickel–iron battery is a rechargeable battery having nickel(III) oxide-hydroxide positive plates and iron negative plates, with an electrolyte of potassium hydroxide. The active materials are held in nickel-plated steel tubes or perforated... Wikipedia
Charge temperature interval: min. −40 °C – max.46 °C
Charge/discharge efficiency: <65%
Cycle durability: Repeated deep discharge does not reduce life significantly.
Energy/consumer-price: 1.5 – 6.6 Wh/US$
Nominal cell voltage: 1.2 V
Self-discharge rate: 20% – 30%/month
Specific energy: 19-25 Wh/kg