I dont have it checked. I dont think i ever used it with force gps on to be honest. I dont know if its BW or my phone but the last two builds of BW have been struggling keeping everything updated.
I always just used the gps settings in the locations menu. That seemed to work fine I believe. How much battery does force gps use?
My location was always off by having geolocation checked. It fixed it self by checking force GPS. Honestly I didn't notice a change in my battery usage. Hopefully it works for you.