Originally posted on ToolNerds.com.
As is often the case, when you upgrade a Makita cordless power tool you’re inevitably left with old batteries. Sometimes you can solve this issue by modifying your new tool to accept the old battery, but do you really want to be doing that to your brand new tool. Instead, you can very easily modify the old battery so it will work with your new tool, keep it in the great condition you have it in plus the benefit of having additional power sources available from your old batteries.
Check out the below step by step guide on how to convert those old batteries.