My new Trend arrived late Friday, it spent 24 hours on the charger as recommended. I used it last night while I was roughing out a bowl and doing some sanding. Man is that thing SWEET! It is so nice to go in the house and not be plucking eye buggers from the corners of your eyes all night. I didn't wake up in the middle of the night all congested as usual. I found it comfortable to wear and enjoyable to use. I have a question for loong time owners.....Do you let your batteries run low before recharging or do you recharge nightly to avoid running low during use.