Cessna 210 Centurion / Turbo Centurion 210C; 210D
Flight Crew Multiengine; Flight Crew Commercial
Flight Crew Last 90 Days 78; Flight Crew Total 540; Flight Crew Type 522
Troubleshooting; Workload; Distraction
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Clearance
Flight Crew Overcame Equipment Problem; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
Due to battery failure; I lost all electronics; radios; EGT monitor; and gear operation failure upon take off/climb when I retracted the landing gear with the gear lever. I initially squawked 7500 in error before correcting squawk to 7600. I was finally able to get partial (very intermittent) communications with ATC on my second radio. ATC cleared me to return and land. On my initial return to airport; the gear was not down so I executed a go-around in order to manually pump the gear down in to place. Then; I returned to the airport and safely landed. Upon safely landing; I taxied to [FBO]; called FSS to close my flight plan; and then called the tower. [Maintenance shop] on the field diagnosed that it was a bad battery and made the necessary repairs.
A Cessna 210 pilot reported a complete battery failure; which resulted in multiple instrument failures; and necessitated the manual extension of the landing gear.