NES battery replacements

I am looking for someone that has some experience in replacing batteries out of nes, genesis and super nintendo carts. If you have done this and have experience, I am looking to get a whole bunch of cart batteries replaced. If you can help me out, please PM me.

Thanks.

This is a very easy job, why not learn to solder and buy $25 in tools to save yourself the cost of having someone else replacing your batteries?