Manuforti

Hey guys. New to the forum and hopefully you can give me some advice. The 18v batteries for my dc618 (UK) nailer are slowly dying. The problem is for the life of me I can't get compatible batteries to work on it. I've even tried the DeWalt adapter to use the new slide battery on it, which I borrowed from a work colleague, but still nothing. On both compatibles and adapter the nailer gives one pulse of power then the LEDs flash to indicate a flat battery then nothing. I can get genuine ones from my local stockist and online but they are still around the £70 mark. A lot of dough for old tech. In the end I may just have to suck it up and buy but thought someone out there may have a better idea. It seems that it's the only DeWalt tool that will only work on genuine batteries. Thanks guys