[Android PPSSPP] Controller and Battery

[Cajux]

Hi there. I normally use PPSSPP on my PC, but since it's somehow weak, I decided yesterday to try the Android's PPSSPP on my recent tablet. I'm talking about an ASUS Memopad 7 ME176CX. The things is, since I have PS2 controllers and a PS2 Dual Adaptor, I managed to play PPSSPP on my Android with my controller. However, it seems that this consumes a lot of battery, and when I tried playing without the controller, it seemed to me that I was consuming less battery. I have been researching but I haven't found any specific answers. So, does using a controller on the Android for PPSSPP really consumes more battery. And the final question, will it end up decreasing my battery life a lot? Thanks for the answers, guys!