Originally Posted by The Inflicted
In my experience, energizer lithiums are pretty crummy for running a paintball gun. They just don't interact well with the capacitor and can't supply the amperage needed to actuate the solenoid. My old roomate and I experimented with them and his Phenom wouldn't even fire with them. We ended up using them in the smoke alarms.
Unless you can find a high-quality 9.6v rechargeable battery kit, which are always pretty pricey, you're probably better off sticking with alkalines to power the gun.
Lithiums would probably be OK for running your loader, though.
Agreed, these markers require a larger potential across the board. Half of my marker issues are battery related, do not use the energizer green packaged rechargeable batteries, they only provide 150mAh (stands for mili-amp hours). Looking into getting some aftermarket hi lithium rechargeables from a battery company, some have an average of 500mAh.