so how much power has the battery produced in its lifetime? and how big is that per volume in compared to modern day batteries. (Because the bell itself just uses very little energy). And has anyone hooked up a volt meter from time to time to check up how fast it is dropping?,(reply>), approximately 1.4 mAh, or 1/1428 that of an iPhone battery.,(reply>), less than your cell phone LiPo battery produce in one discharge, the discharge rate here is minuscule, the interesting bit in this experiment is how long dry cells can last when well sealed, centuries as it turns out...,(reply>), or you can like, very go on Wikipedia,(reply>), @Michał Hickiewicz no, they say each time the bell rings... for the current. Wich means You need to know how long the contact lasts because it's not continues.,(reply>), P=U*I <br>U and I were in the video