tanheyin 18v to 12v step down converter for milwaukee m18 battery, 240w dc 12v voltage regulator for power wheel adapter, ride on toy car, diy projects, buck converter with switch & over-discharge protection 1 pack is up for auction in Tools & Home Improvement. The current bid is $3.00, 86% below the $21.59 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.