I have a 12 volt battery charger with no opition for maintenance free , can i still use it to charge a mainten

The better question is: Why do you need to charge it?

Is the car sitting around and not being driven? If so, you need to get an automatic trickle charger. If it's daily driven, do you have to boost this battery or charge it often? Are the cables corroded and or lose? Alternator working OK? Worn out belt? How old is the battery? Some batteries last 5 or 6 years but on average they can short out a cell and become weak in as little as a 3 year span. BTW... a shorted or dead cell is is actually 2 dead cells. Have this battery load tested before you get stranded.

Absolutely. A battery charger is a battery charger....it makes no difference whether the battery is maintenance free or not. If your b/c is the correct VOLTAGE for the battery you're charging, you're good to go. Some battery chargers may charge at a different rate (ie.. 1amp, 2amps, 4amps, etc...) but this is just how quickly they will charge a battery. Higher amperage equals less charging time.

usually maintenance free batteries are just that depending on how old it is you would probably be better off buying a new battery,but if you want to charge this one some of the maint free batteries can have the top covers takin off with a flat head screw driver,if cant get top covers off and you put battery on charger the gasses that build up in side the battery could explode on cause damage to you and or the battery,

yes the battery and charger will be fine. If you have more time to wait and there are different amp settings then use the lower one that will take longer. This is better on the battery. If not much time a higher amp setting is not much worse but just not as good for the battery.

Charges are based on voltage not what kind of battery you have either 6 volt or 12 volt<

Yes you can. Put it on 12volt high and a high amp like 3amps. And charge your battery for about 5 to 10 mins on that setting. Then switch the setting to low and a slightly lower amp setting and charge it for about 30 min. Then you should be done providing the battery isn't at a state that it can't be recharged.

yes the maintainance free only means that the battery will not require topping up with distilled water, the maintenance free bit has got nothing to do with the charger,

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basically a maintence free battery need not be charges as their positive and negative plate inside the battery is not the same as conventional battery

Yes same difference.