Laptop Battery Technology in a BoomBox Stereo?

[suicideneil]

Colorful looking blaster...

Regards diodes, since the battery & charge circuit will be in parallel to the radio essentially, I figure a single diode in series between the battery and charger 9a long the ground wire ) will prevent current flowing back from the batt to the charger, but allow it to flow from charger to batt. Wouldn't like to guess at the rating required, thats a job for BG.