Is it okay to store batteries in the fridge?

It is completely fine to store them in the fridge. Do you need to? Not really. Will it extend their life? Technically yes, but in reality the gain is so minimal that its not worth the energy needed to keep them cool. Batteries today (common AA, C, D) made by like Duracell already advertise a 10 year shelf life. Which means they have managed to isolate the reactions so well that there is almost no degradation. Putting them in the fridge will slow down that degradation, but do you really want to add 6 months to a year of shelf life to a battery that already lasts a decade? You also run the risk that the battery will not perform when needed. The voltage that is claimed on the label is essentially that of room temperature. Out of the fridge the voltage may not operate your device until warmed up.

In the end, this is a lot like saying adding salt to your pasta water raises the temperature and makes it cook faster. Yes, adding salt does raise the temperature, but a normal few teaspoons of salt does almost nothing. Same here, keeping the in the fridge does minimal benefit.

Definitely not, just put them in a low humidity, and not excessive temperature, and it will be fine. I have made myself the test, 10yrs ago and it did not gain one day over the manufacturer suggestion. Frankly, at the prices that are now, I would not bother much... Hope that helps today peoples also. 

why , in a fridge its cold and batteries dont work when there cold !!!

Most battery manufacturers do not recommend storing batteries in the fridge. While the cooler temperature might lengthen the battery life, the moisture from inside the refrigerator could damage the battery in other ways. If you opt to keep batteries in the refrigerator, store them inside a sealed air-tight plastic bag.

Oh, jeez, here we go again with this crap. 

Storing batteries in a refrigerator DOES NOT MAKE THEM LAST LONGER. 

Period.     

Store them in a naturally cool, dry place.    

Use the oldest ones --- or those with the nearest expiry date --- first,  

but ALWAYS use them in matched sets.  

It's an old wives tale when batteries were carbon/zinc.  Today's lithium batteries do not need it.

just make sure they don't touch opposite poles. that drains them. buy a battery organizer.

I don't even put them in Ziploc bags I just leave them in the battery pack