All my tools are DeWalt and I now have a bunch of Ridgid from all the sales.
I modified mine to work with a Ridgid battery. I took the terminals out of an old DeWalt 12v battery.
I also made an adapter for the DeWalt battery using a cover that comes with the flex volt battery. This one just clips in on the contacts where the Ryobi battery would go.
But I will just use the Ridgid battery because of the lifetime warranty.