ATA 39

If your Davtron 811B clock battery gets below 5 volts, problems will be evident, such as running fast or slow and possible losses of memory, showing random times when starting up and the inability to reset flight time. Davtron offers 24 hour turn around repair, but they suggest that a new battery be placed into service before sending it in. Often a new battery will correct and stabilize the unit. If not, then the unit should be sent in.