I have a Joye eGo PT that has only seen LR attys and cartos with no problems. It's a backup PV so it's not in my main rotation but that thing is a champ. I never have to worry about having a fully-chared PV. I love the plug and vape, unplug and go aspect of it. "They" say not to use LR attys/cartos on eGos. I haven't had an issue. If you're shopping a new Fat Batt I'd look at the Kgo. It has higher voltage and 1100 mAh. It hits like a high-priced
mod with a LR atty or carto. Riva would be my second choice, less voltage and mAh but still nice. eGo would be in 3rd place. If buying an eGo, get the
Joye brand eGo. You can tell by the button if it's a knock-off. Some eGos have had sticking issues with the firing button stuck in the 'on' position.
KGO:
BreezEsmokes - Premium Electronic Cigarettes
Hoosier also sells them. Others do too but I stick with ECF suppliers.