White crystals in battery fluid

[David Discenza]

Hello. I was topping off my batteries and noticed small white "flakes" or crystals floating in some (not all) of the cells. A search of the internet has yielded nothing. What could this be and is this a problem? The batteries are holding a charge and I've had no issues with them.

Thanks to all who reply.

[mainesail]

batteries are heavily sulfated...

[Ron Hill]

David : As MainSail said your batteries are sulfated -- and things will only get worse!!  I sulfated out a battery when I used it slightly, but constantly recharged it!

A thought

[Noah]

Depending how bad they, what kind of charger you have and what brand batteries, you might try "Equalizing" them:
https://www.trojanbattery.com/tech-support/battery-maintenance/

[David Discenza]

Mainsail, Ron, Noah
Thanks for your reply. I'll check with my marina to see if they offer "equalizing" as a service.

[Noah]

Equalizing your batteries is something you don't need a marina for.

[Jim Hardesty]

I'll check with my marina to see if they offer "equalizing" as a service.

Instructions are in the manual for the battery charger.  That is if the battery charger has that cycle.  If you don't have the manual, google the manufacturer and the model number most instructions are on-line.   
Jim