Corrosion means the seal around the post has broken. It's not a problem for the battery supplying the required power, but it's a huge problem for eating terminals, rusting out metal below the battery etc. The corrosion can cause a huge amount of damage to other stuff.
If a battery did that to me inside warranty I'd be wanting it replaced free. If it's outside warranty but still in use I'd be replacing it myself and possibly never using that brand again.
Here in NZ Exide are chronic for it, I refuse to buy them. My 10 year old century (long past retired from vehicle duties but does workshop 12v supply duties) just started doing it. My 5 and 6 year old supercharge batteries haven't done it yet and the 4 year old bosch hasn't done it either.
My 1 year old Century-Yuasa battery is identical to the supercharge.



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