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AFAIK Tony Duell uses his 9114 w/o rechargeable battery.
However, replacement types for the battery are available
from specialized battery shops.
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If you have the battery housing (which includes the charger PCB), you can replace the battery itself with 3 2.5Ah Cyclon cells (these are cylindrical lead-acid cells) wired in series. As usual, the red wire is positive.
If you are missing the entire battery housing, you can power the 9114 using a 6V supply (it doesn't need to be too well regulated) connected to the 2 pin mini-jones connector inside the cavity on the back of the 9114. I can't remember the polarity, but if you take the 9114 apart (Torx screws on the bottom), you can see the back of this jones plug, again the red wire is +ve.
Be warned that a 9114 can draw well over 1A from the battery, so you need a reasonable PSU.