If your worried about it going pop, then you could hook it up to a low output constant current circuit (~100-500mA) and monitor it to make sure its not getting warm. If it get warms or hot at those currents then it could be a duff one. It will take a while to charge though for 9.5Ah at those currents.
If you do successfully charge it, monitor how long it took and be a good idea to verify its internal resistance