Rechargeable, replacement battery for Nicro Ventilations Day/Night Plus Solar Vents. A high capacity C-cell battery that is environmentally friendly, this rechargeable battery works with current Day/Night Solar Vents as well as older models Power Vent 3000 and Day/Night 2000 Vents. With an average life span of 3 to 5 years, this battery will keep your vent running economically and efficiently. Specifications Type: C-cell (2800mAh) Volts:2 Amp Hours: 2 Average Life: 3-5 years Warranty: Two years