My bosch 36volt has lost its sds function and has become noisy when using it

Maybe the armature will suck on the batteries i think replace the armature will last also more time on the batteries if its have a terrible snarping sound yes its eating the brushes also and its used more power and has even power lost compared with the early days, and if the armature is changed you will absolute hear it runs with a smooth sound and the batteries are remarkable lasting longer . because much people think the capacity of the batteries but the armature is the case you will see nothing outside the armature but measure will give the proof.
brushes and armature replace always together the sds is a little comlete kit to change but that noise comes in most cases only from the armature.