4.8 volt Rechargeable Battery made for the older White's metal detectors. 5900 and 6000 di pro and SL models, 3900 and 4900 models Eagle series detectors, TM808 and Spectrum. Works with the Whites 509-0017 or 509-0020 charger (not included) Save on batteries with is 3300mah nicad battery. The batteries are new, original case bottom and top. Each rechargable battery is tested before shipment. Free Shipping.