I have one njoy atty connected to a usb passthru powered by a external pwr sply. I drip it daily, morning, afternoon, evening when I am home.
Never cleaned it, only "drain it" overnight. I have been using it since Feb 09. Always works!
801 attys, different story. I lost one after one day, measures 75 ohms. I suspect bad solder. I can't blame use for that kind of failure. Poor quality.
I have lost several 801 attys since March, all measure high resistance now. All have been replaced.
I try not to rotate, I want to "see" a failure rate so I can begin to trouble shoot.
I only use 2 types, Npro and 801:
Npro, drip only(carts are too small). My "drip station" runs 5 volts at 1amp. This combo is great, nice warm vapor, full juice taste, easy to change flavors. I am working on a mod for a manual switch. Still using vacuum type usb passthru.
801, use 3.7 volt batteries with mods or with USB, rarely use "cig battery". Drain over night, clean connections with microfibre cloth. Try not to drop them. Never let them run dry. For weeks now I am using manual switch type units. Got tired of battery cut off.
Still trying to figure this stuff out.