ferryboat 18v 4.0ah battery replacement for ridgid 18v battery compatible with ridgid lithium battery r840087 r840083 r840085 r840086 cordless drill tools is up for auction in Tools & Home Improvement. The current bid is $4.50, 76% below the $19.00 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.