Service and maintenance
8.2 Battery replacement
54
SONO 3500 CT
Operating Instructions, 07/2019, VI.SH.P2.02
Battery lifetime
The battery lifetime depends on the frequency of mains supply failure. Under normal
temperature and working conditions a battery can have an operation lifetime up to 6 years.
1. Unscrew battery cover and remove old battery pack.
2. Fit new battery pack in transmitter.