Hi
How did he managed to get shocked? The battery case is plastic and only the connectors are metal which you will unlikely touch. Unless some sort of static build up occurs?
I guess as far as risk is concerned its up to the owner. One thing is very sure though. OEM types always over specify their rating and almost always underperform. i.e. an OEM rating may be 1500mAH, higher than the original 1200mAH but in reality, it runs out faster as is the case above. But as a backup batt, they are value for money. In my case, i almost never need it in Singapore...only if I am overseas which is seldom. I got a backup battery pack for my Fuji F200EXR and till date only used it once overseas. I charge it once a month or so to keep it healthy.