|The pen battery for the Stylistic 1000/1200/2300 is just an alkaline 1.5 volt AAAA battery. These are available from Radio Shack, Camera stores and the like. |
Durcell 9V batteries are build around six AAAA batteries, breaking the case apart yeilds six batteries usable in the ST1000/2300 pen. Not all 9V bats are built the same, only Duracell is known, for sure, to be this way but others may have similar construction.