Do I have to use the batteries that came with the BCD436HP or can I use any rechargeable batteries, and I have a battery charger that I bought at Wal-Mart can I charge the batteries using this charger or do they have to be charged in the scanner ?
Thanks
You can use your own rechargeable batteries, and charge them externally in your own charger. That's what I do. I use low self-discharge batteries such as Sanyo (now Panasonic) Eneloops, Imedion (made by Maha, which also makes one of the chargers I use), and some Amazon Basics. I don't charge in the scanner, since if a battery overheats and ruptures, that would damage the radio.
You do, however, need to leave batteries in the scanner, even though you are not charging them there. Without batteries, the recording and replay features are disabled.