love using the Puffco Plus. Bought an extra battery this time.
I've used this guy everyday for a real long time. The thread has worn down before the actually battery degrades in quality hits, and I suspect it had something to do with the cheaper 510 thread cartridges I have used with it in the past (works great with those as well). However, it still works/fits great with the Puffco Plus heating element. Quality stuff, definitely worth having a second battery to keep sessions going or just back up. Because, well, life.
Best battery ever