charging problems

[marchyboy]

hi all got a slight problem went to charge my archos 7 160gb and cant remember which charger to use as i have loads of them all with different volts on them can somebody have a look and tell me if the output is 7.5 volt =350ma anyhow i tryed using this one and it wont charge battery it just seems to heat it up now not sure what to do next any help please