Write cache disabled due to battery failure

We have an older CX4-120, and the internal batteries have failed. It's too expensive to replace at this point, since the array is already protected by datacenter power protection. However, due to the battery issue, the write cache has been disabled, and that is leading to extreemly poor performance.

This is just a DR array, and we are not too worried about the battery issue.

Is there a way to over-ride the write cache and force it to be enabled???