How much of a problem would it be with most flashlights to use say two CR123A rechargeables (like the one's available from Zbattery.com) that run at 3.6v rather than 3v? For example, I have a Pila GL2 which takes two C123's and has a 6v bulb - it is likely to damage the bulb to use two of these rechargeables that would total 7.2v on a fresh charge? Or would it just reduce the lifetime of the bulb?