Vibrators!!!

Okay soo me and my girlfriend went and bought a pop vibe bullet vibrator today and when we got home and tried it out the thing lasted like 20 min. So we thought, oh these must just be some shitty batteries that came with it. So we go out and buy more batteries and guess what same problem. And the store obviously does not do returns and it was just a waste of money. Now were looking for another one maybe rechargeable or something, anything.. Any suggestions? Just want something small but will actually last.