Use it if possible. If not then do a storage charge with your charger. Personally I feel that it would be easier to use it then put it ob storage charge. Then you batteries will be good to go for weeks on end.
Rule of thumb on any battery ... Not any more than 80 percent of your total mah value You find out how much you did by charging it and seems how much you put in
On this battery that nothing more than 2040mah
You follow that and the voltages will work themselves
yep ... you can safely use 80% of your battery power. If you are not sure what that is .... run your battery for 4 minutes using your normal flying style.... and then do a fast charge. take note of how many MAH you have added to the battery to get to full charge. what ever that is divide by the flight time and you will have the average MAH per minute used. Then you can safely work out how many actual minutes you can used that battery to get to your 80% draw down. - Hope this helps