Arrived to customer house. Perform annual tune up on natural gas generator Installed in 2015 Honeywell unit in good condition. Changed oil, changed oil filter, air filter, spark plugs refill and oil reset reminders. Cycled unit on to test. Checked oil and oil levels all good. When I proceeded to inspect the battery, it did not give me any voltage. I talked to Customer and I explained that unit need a battery. Customer told me that he did not want to proceed with option at this time. George is very happy with today's service.