I managed to use this gun for awhile but for some purpose (which I do not know) It has stopped working. I try to charge the battery and nothing seems to happen. Worked perfectly fine before! I noticed that on my battery It has: NI-CD AA500mAh 7.2V 
  
Now on my AC/DC Adaptor It says: 
  
MODEL: YH35-072250 
INPUT: 220-240V~50/60Hz 
OUTPUT: 7.2V-250mA 
  
I noticed that the battery Itself has AA500mAh and then the charger has 250mA - Am I using the wrong charger? I am not that good at this kind of stuff and wanted to ask someone who knew about this stuff. 
  
I just wanted to get some suggestions before I went and bought a new battery and charger to see If this works. 
  
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