2004 Dodge Caravan Van Intermittently Not Starting

We first noticed it failing to start a few weeks ago. After running the radio/interior lights/DVD player, the van wouldn't 'turn over'. After jumping it, the van ran fine and we were able to start again without issue, but this problem repeated a few more times after this, always after using minor items in the van like the radio or interior lights. We had the battery charged but were told the battery's power wasn't that low to begin with. Just wondering if anyone has other suggestions on what could be causing the problem, it seems electrical but I have no idea what to look for!