The Yeti is a 510 just under a different brand name. Differences is the Ego, Riva, Hello and others in the same size range have a bigger higher rated battery that can go longer in between charges. This is an average and it will depend on a lot of variables, most being how often it's used but most say they get around 2rs in between charges on the 510 and similar batteries and 6-8 hours or more on the Ego and Riva style.
There is a size difference also. The 510 is a pen style device and looks most like a cigarette in diameter. The Ego, Riva etc are more in the diameter of a cigar.
If the size matters to you and you want to stick with a 510 and use it more than an infrequent basis I'd recommend pickup up a extra battery and charger with the kit or a PCC (Personal Charger Case) which has it's own battery and can charge the 510 when you're away from home.