The lights on my bike are a 12v car head light and a 12v trailer brake/tail light. I've found some small 5 inch/five pound batteries in 12v and smaller in 6v used for game feeders and outdoors type things. They're a sealed battery and can use a plug in charger. I'm wondering if one or how many of these would be enough for one or two hours of light. My plan would be to wire with an on/off switch and a voltage regulator if needed. I can also switch the bulbs to 6v if needed for around ten dollars thanks to ebay. Will this work? Need some help.