The amount of corrosion is not normal. I suspect that either a battery exploded or cracked, or boiled over. It's possible that there is damage to the hydraulic pump and probably many other components and devices in the compartment. The cause of the corrosion is disconcerting. A thorough evaluation of the charging circuits is in order. I'd get the dealer to replace everything that has any corrosion, clean the compartment, replace the batteries, and give you some type of extended warranty.
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