I know of 1 huge grocery chain that, in at least 1 of their large distribution centers, decided to assign a battery per operator, and not a forklift per operator, they used and checked out the next forklift in the line for their shift/day, but always had the same battery. it meant that all the forklifts got looked over by different people every day (and at first generated too much work for the service department, but about 3 months to 2 years later, meant the service department had time for training the techs that they had never seen). it also (about 6 months to 5 years later) cut down on poor battery maintenance and resulting battery replacement, since they knew whose battery was not taken care of. they cut it out, because one of the requirements was the operators -had- to schedule a 1 week vacation while their battery got an annual acid adjust/load test/ maintenance.