Battery life

[Spectre45]

Lets say you're pretty much breathing through one of the regular manual batteries. About how long should it last before needing a recharge?

 

[crand]

With heavy use I've found 60 to 90 minutes

 

[Spectre45]

With heavy use I've found 60 to 90 minutes

I figure 10-15 minute drive to work, 15 minute break, and then it's been dying about halfway though my half hour lunch. So less than an hour, but I'm not sure if it's the same battery every time.