I would look for any Canon BP-911 battery brands. The BP-911 is the size/cell that fits both the back and XF. Only problems I have run into at times is heat build up, where the cell will expand during use on a hot day and stick inside the XF or IQ back. This was a problem with a silver battery type of the BP-911 a few years ago.
The other thing to look for is the millamp rating, as the Phase cells are now 3400, higher the millamp longer the life of the battery/run time. Also make sure the voltage is 7.2.
Personally I feel Phase needs to get to around 4400 to 5000 millamps in these batteries.
Paul Caldwell