It sounds to me like you have a bad battery.... how old is the marker?
What you could do to determine if its bad or not is, get your hands on a adjustable DC power supply and apply 18v to the battery terminal of the marker and see if it still fails. Just be very carfull not to apply the positive of the supply to the negative of the marker b/c you could burn the board!!!!!
What you could do to determine if its bad or not is, get your hands on a adjustable DC power supply and apply 18v to the battery terminal of the marker and see if it still fails. Just be very carfull not to apply the positive of the supply to the negative of the marker b/c you could burn the board!!!!!

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