If, the act of removing that phillips screw will release the battery and allow the battery to slide out from its enclosure then we have only solved part of the problem.
- It looks like there is a wire soldered to the battery?
- It looks like the case would still block the path for sliding out the battery?
Does anyone know if/how the remaining top part of the case could be pried off of the hearing aid electronics? These was some discussion here, How to replace hearing aid housing.