A BE33 LOST ELECTRICAL POWER AFTER TKOF AND WHILE ON AN APCH TO A NEARBY ARPT REGAINED ELECTRICAL TO LOWER THE LNDG GEAR AND GET LNDG CLRNC.

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ON CLBOUT FROM ZZZ; COMPLETE ELECTRICAL FAILURE OCCURRED BEFORE BEING HANDED OFF TO DEP CTL. ENG PERFORMANCE WAS NORMAL. I THOUGHT THE AVIONICS MASTER SWITCH HAD FAILED SINCE ALL THE RADIOS AND XPONDER WERE BLANK. I GOT OUT MY HANDHELD RADIO AND TRIED TO REACH ATC AT ZZZ. I COULD HEAR THEM BUT THEY APPARENTLY COLD NOT HEAR ME. I PLANNED TO FLY TO ZZZ2; ENTER THE PATTERN AND WAIT FOR LIGHT SIGNAL AUTHS; OR MAYBE THE HANDHELD WOULD XMIT ONCE IN CLOSER RANGE. I FLEW TOWARD ZZZ2 AND ATTEMPTED TO LOWER APCH FLAPS; AND DISCOVERED THAT ALL ELECTRICAL PWR HAD FAILED. I THEN FLEW N OF ZZZ2 AND GOT OUT THE CHKLIST FOR MANUAL GEAR EXTENSION. I WIGGLED THE BATTERY AND ALTERNATOR SWITCHES WITH NO RESPONSE. THEN; WHILE STARTING THE GEAR EXTENSION CHKLIST; ALL PWR CAME BACK ON. I LOWERED THE GEAR AND APCH FLAPS. I CONTACTED ZZZ1 APCH AND TOLD THEM I WANTED TO LAND AT ZZZ2 BEFORE THE PWR WENT OFF AGAIN. THEY TOLD ME TO CONTACT ZZZ2 AND SAID THEY WOULD CALL THEM TO WARN THEM OF MY POSSIBLE PROB. I CONTACTED ZZZ2 AND ASKED FOR THE TWR TO VISUALLY CONFIRM THE GEAR WAS EXTENDED. THEY DID AND I WAS CLRED TO LAND AT RWY XX AT ZZZ2. I THINK I MAY HAVE VIOLATED ZZZ2 AIRSPACE WITHOUT A CLRNC DURING THE TIME I WAS DEALING WITH THE PWR FAILURE AND POSSIBLE GEAR EXTENSION; BUT I FELT IT WAS BETTER TO GO TO ZZZ2 RATHER THAN THE BUSY CLASS C; ZZZ1. MY MECH FEELS THERE IS A BAD WIRE CONNECTION OR RELAY TO BE TRACKED DOWN.