Over reved alternator?

Yesterday i took my car for a spin it ran fine when i parked it .i got back in it later and i wound it up like i normally do once in awhile 6500 maybe close to 7000 going through the gears then i slowed down and noticed my gauges acting all funky .tach bounced all over and speedo to zero.so when i got home shut it off then no start.check the battery and its only 9.5 volts .it just started fine 5 minutes before so must have had 12v.so i am wondering if the high revving could cause the alternator to wreck the battery .its a 1wire 100 amp alt i think and optima battery. I rewired the whole car last year and it's been good so far. Also jump started the car and revved up abit and the alt was putting out up to 14.2v. Any help is appreciated

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