Battery Reconditioning

I have a crosman m74dp and it runs on 4 AA batteries. I was wondering if I could modify the wiring to be adaptable to a normal 8.4V rechargeable battery in normal airsoft guns? Also if you have any modifying tips for this gun, for example: how to make it shoot farther and harder, that would be great because I already know that with a better battery it will increase the rate of fire.

I agree with the other guy, messing with the wiring is much more complicated than you have to make it, buying AA rechargeable batteries are your best bet. http://www.duracell.com/en-US/product/rechargeable-batteries.jspx is an example of the batteries

I have 2 1.2V rechargeable batteries and a 5V power source.
Will current be lost and will it damage the power source or the battery?
It is only charging at 5mA while the rechargeable is 800mAh

Depends on several varibles, like the current rateing of the charger and of the batteries. The 5 v is too high and can overcharge and overheat the batteries and shorten their life cycle. So the charging has to be monitered. People do use higher voltage chargers to "quickcharge" their bateries, but most of those are so called "smart chargers" and divert the current from the batteries when they reach full charge and indicate that charging is done. I don’t know the mahr size of your batteries or the output of your charger and as I am using a Casio Brigade in mobile mode, ( my computer is down at the moment so this is all I have) I can’t get back to a question once I post an answer so if you add later info I can’t use it. So all I can add is try it and keep checking the temp of the batteries. As soon as they begin to get hot to the touch, stop charging them.

I got a 10 pack non-rechargeable batteries and I’m only going to use two of them. So, I was curious to if i don’t use the rest of the batteries for long time like 2-3 months. Do their battery life is reduced?, are they slowly discharged? OR are they the same after such a long time?

There are a lot of types. If you mean regular alkaline batteries, 2 or 3 months won’t hurt. They take more than 5 years to lose half their charge.

I bought my spyder rocking trigger and it didn’t come with the rechargeable battery so i put a regular 9.6v battery in it and it says it has a low battery and automatically turns on safety if you shoot too fast… It was a brand new battery so I know it wasn’t a low battery… If thats not the problem ten cam you tell me what you think it is??? Thank you for your help…

The Spyder RT should work with a 9.6v battery and you don’t neccesarily need a spyder rechargeable battery. If it doesn’t work with a regular battery try a different one or try a different brand. If it didn’t come with a rechargeable battery, that means you don’t have to buy one. Just in case, try checking the manual and see what it says. Is the gun used?

I’m thinking about purchasing the nikon coolpix S3000. Does a rechargeable battery and charger come with it or do I have to purchase them separately?

Typical standard items usually tend to be:
Battery and Charger
Software
Owners Manual
USB Cable
Camera Strap
and 1 year warranty