i'm looking for ideas about how to power my cpap all night. for those unfamiliar with this lovely device, it keeps those of us w/ sleep apnea from snoring or suffocating. i had tried daisy-chaining computer ups battery backups, but it looks like apc won't let you do that. i also found out it was limited to 99 min, regardless of power draw. this little sucker draws like 8w, not much, but i need to power it all through the night. i don't know anything about car batteries, but i'm assuming i would just wake up w/ a dead car battery?