Has anyone ever rebuilt or made from scratch a new battery for their lights? I just cooked my nightsun water bottle battery (second one). I checked into a new one and was floored by the price $200. That's alot of beer, ahh I mean alot of school supplies for the kids. I saw a website on how to rebuild one but it is not very detailed. I was just wondering if it would be hard and if it is worth it, time plus money involved? Thanks for any info, J.