To all almighty gurus,

I drive a CR-V Dec 03` and I am experiencing a "thirsty battery" problem.
Almost every 2 Months i need to top up about 500ml of battery water. Is
it normal ? Some of my friends told me that it might be the alternator
fault, it is
overcharging. Hence, lead to such problem.

What should be the normal Voltage reading with the engine turned on and
off ?
My friend measured it with a volt meter for me and it is stated as below:-

Engine On : 14.9V ( Air-cond ...