When I purchased my MP2000, I bought 2 rechargeable batteries. I've used one for years, but last night I got the second one out to begin using it. No luck, it won't charge. Probably been in the box too long. Does anyone know of any way to get this thing to hold a charge. If not, I'm willing to perform "surgery" on it, cutting it open to replace the actual batteries. Does the sealed pack take standard rechargeable batteries? I want to use this thing! Thanks.