Ryobi 6V/12V 2 Amp Battery Charger and Maintainer. Ryobi. Many enthusiasts prefer to put their cherished cars and motorcycles into storage over the winter months, but doing so comes with some risks.

A: If your Ryobi 40V battery is stuck on testing, it could indicate a potential issue with the battery or the charger. Try the following steps to troubleshoot the problem: Disconnect the battery ...

Optima’s New Digital 1200 12V Battery Charger. One Charger for All Your 12-Volt Needs. Dan Ward Writer Patrick McCarthy Photographer Dec 01, 2012. See All 3 Photos. See All 3 Photos.