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The good thing with anodizing is is that it will only use what it needs for power. If you have a battery that will put out 650 amps and the job piece only needs lets say 3amps to anodize, it will only pull the 3 amps.
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Yeah, but only after it's grown enough of a anodize layer to limit the current, which will take minutes at least. When the anodizing process starts the circuit is practically a dead short.
The origin of the car battery internet old wives tale is probably the British amateur telescope makers. The part that got omitted was that they were using partially discharged motorcycle batteries or junked car batteries. The battery was junked because the plates are shot and it won't put out anything near 650 amps or whatever.
A healthy car battery is dangerous for this without the proper current limiting.