WMYCONGCONG WGCD WGCD 5 Pcs 2.1x5.5mm DC Male Connector 8x1.5V 12V AA Battery Holder Case Box with On/Off Switch

If using with rechargeable batteries is it possible to charge them in the box via the plug, or would it require a BMS?

I want to use this with a radio/police scanner. Will it work yes or no?

I can get a voltage reading with the pack turned on, but my battery charger says no batteries found. Is there something I need to do?