Loook at post #43. There is an equation there, E=mc^2. That equation says that if a battery has an energy change, there is also a mass change, no matter how small.
Batteries are chemical-reaction energy systems. No destruction of mass in any way, is what I am aware of. I want you to give me a link on how batteries use up mass to give energy. I am pretty confident there is no nuclear reaction happening in an electrolytic battery.