Cessna Stationair pilot reported an alternator failure and subsequent loss of all electrical power and battery during cruise. Pilot continued to destination airport using portable backup communication and navigation devices.

Narrative

While on a VFR flight from ZZZ1 to ZZZ [in] the evening I experienced an alternator failure. I eventually lost all electrical power in the aircraft due to the eventual loss of the battery as well. As a result of the loss of electrical power I also lost a number of flight instruments and radios. I made the decision to continue the flight since I did not believe that there were any good/safe alternative airports in the immediate vicinity; and that since ZZZ2 is my home area I had a good deal of familiarity with the airports there where I knew I would have to make a landing under difficult and less than ideal conditions; i.e. no flaps; since they are electric in this plane; as well as no landing or taxi lights. In addition; I decided to divert from my original destination of ZZZ to the ZZZ2 airport where they had a control tower that is manned 24 hours a day. and very well lit runways. As I approached the ZZZ2 area I was able to establish cell phone communications with a ZZZ Approach controller via Bluetooth connection from my Lightspeed headset to my cell phone. The first thing I did after establishing communications with him was to 'officially' [request priority handling]; and then appraise him of my situation. As I got into the Class C ZZZ2 airspace the controller gave me the phone number of the Tower controller at the ZZZ2 airport and I called him and established continuous cell phone communications with him. We exchanged position information; and he gave me a clearance to land on Runway XXR. I entered an extended base leg for Runway XXR and safely landed. He then transferred me to the Ground controller whom gave me progressive taxi instructions over to the FBO.I had a number of devices with me in my flight bag (backpack) that I kept on the Co-Pilot's seat next to me that were useful in being able to complete the flight safely. In my opinion the most important of these were a Raspberry PI Statux portable USB powered device with an AHRS and GPS chip in it along with a number of USB backup batteries that I could use to power the Statux. I also had two iPads with Foreflight software that were capable of receiving data from the Statux which then provided me with attitude and location information. I also used the USB backup batteries to ensure my cell phone had an adequate charge.