it's entirely possible that you've experienced a failure of the mosfet chip that drives (afaik) all factory 'batteries', which are actually a battery with a chip and a switch and an LED, more accurately called a power supply [510, ego/riva, etc). uncommonly, yours has died in the closed position. the switch on the outside of your power supply activates and deactivates the mosfet chip, the flow of current doesn't actually go through the switch (again, afaik). this is a relatively common occurrence when these batteries are used with low resistance atomizers/cartomizers, which draws more current than the mosfet (and the battery too, probably) are rated to handle. unfortunately, most vendors (and manufacturers) have been either ignorant or dishonest (or a bit of both). low resistance atomizers/cartos (around 1.5 to 2.0 ohms) require around 2.5 amps of current to reach 3.7 volts, and factory power supplies with their mosfet-driven batteries aren't capable of putting out this much current for long. sometimes they just simply last less and less time per charge (the battery slowly loses capacity) and sometimes the mosfet dies. even if you weren't using a low res atty/carto, it seems most likely that your mosfet has died. there's nothing that can be done to resurrect this kind of battery with this kind of failure (one more time, afaik). hope i've been helpful. i'm a bit tired and kinda feel like i'm rambling..