The topic has been discussed in the newsgroup.
Some people have pried the top off a battery which has no filler caps and
topped up the fluid to make the battery last longer. I'm one.

Ryan Underwood ) writes:
> Here's a short quiz.
>
> 1. With respect to lead acid batteries, "maintenance free" means:
>
> a) Maintenance is done by the seller at no additional cost.
> b) There is no maintenance procedure that can extend the life of the battery.
> c) Even if there were such a procedure, the battery has been designed in a way
> that makes it impossible, in order to cut manufacturing costs.
> d) Even if there were such a procedure, the battery has been designed in a way
> that makes it impossible, in order to sell you a new battery on a shorter
> schedule.
>
> The question I'm really getting at is whether or not "sealed" batteries ever
> run low on electrolyte like "capped" batteries do. If they do, it seems like
> the battery would have an artificially short lifetime if it is not possible to
> add fluid as necessary.
>


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