* Li-Ion Battery Packs: Used for Trail Tech helmet lights. The Li-Ion batteries are a high performance, low weight solution. Helmet lights can also be run from a vehicle mounted battery. Two battery packs can be used to power the Trail Tech 8 Race Light, in order to avoid a DC conversion (you will need a special connector cable.) * NiMH Vehicle Mount Battery: Useful for DC conversions. Similar to the helmet light battery packs, but mounts to the bike and is recharged by the bikes electrical system. * Capacitors: Capacitors can take the place of batteries in DC electrical systems. They store energy, then release it if the vehicle power drops momentarily. Will not provide power if the bike is turned off.