how to double battery life

[skyboy09]

I use a tesoro Vaquero which requires a 9v battery. A fresh battery usally lasts me about 9 hours with headphones attached. Is there a way to link 2 9v batteries (series or parallel maybe) so they can deliver the same voltage but provide twice the battery life?
I know nothing about electronics but I remember seeing a post about this topic a while back but I can't remember where I've come across it. Would this be a tough modification to undergo?

[GibH]

I use a tesoro Vaquero which requires a 9v battery. A fresh battery usally lasts me about 9 hours with headphones attached. Is there a way to link 2 9v batteries (series or parallel maybe) so they can deliver the same voltage but provide twice the battery life?
I know nothing about electronics but I remember seeing a post about this topic a while back but I can't remember where I've come across it. Would this be a tough modification to undergo?

Wouldn't it just be easier to carry a spare? You can't wire them in series, it would have to be parallel.

[CZFisher-man]

Wouldn't it just be easier to carry a spare? You can't wire them in series, it would have to be parallel.

This thread and this post made me laugh , "wouldn't it be easier to carry a spare", good point actually, hehehehe!

[U.K. Brian]

In the U.K. they use to sell a box to fit under the armrest that took AA batteries and this provided a power sourch that could cope with load better which most thought both helped stability, provided greater detecting time and helped balance out the weight of the coil. Can't say I've seen them advertised of late but then battery technology has come on so much that its probably not needed.