Enquiry about Battery Life

Guys, am new to iPod touch. Just bought iPod touch 5g before 2 weeks. I want to know what battery life fellow users are having.

As said I am able to play music for 38~40 hours.

But when I use wifi,location services,browse internet,access mail the battery depletes some 10~20% immediately.

When I play games like sonic dash,inifinity blade,plants vs zombies 2 for some approximate 45 minutes(wifi,location services OFF) battery depletes some 40%.

Is this normal ???

What is the battery life in ipod touch regarding wifi and gaming ?

Please help me.