I've had my scanner for a couple weeks now and love it. I figured out all the programming and seem to be listening to frequencies as it was intended. However, I bought some rechargeable batteries but the instructions are very vague. The manual (and youtube videos) stress that you should only use the yellow holder and be careful NOT to overcharge your batteries. I bought 4 NiMH 2500 mAh but I'm not sure how long it takes to recharge them. I used them in the radio until they were totally dead. Now I'm worried about leaving them charge too long. Any information would be great.