MBP 1,1: strange noises, battery failure

My MBP 1,1 (SL, 64GB Samsung SSD) recently started to make strange noises from within. It's hard to decribe, but it sounds like rapid crackling, like a hard disk put into overdrive (however a SSD is installed). Along with that, there's a high-pitched monotonous  sound.
The noise is the loudest somewhere between the ExpressCard cage and the battery multiconnector cable.
Further, when the Mac is running solely on  battery power (without the MagSafe being connected), power suddenly goes off without any warning. Although fully charged the battery LED blinks indicating it's empty.
What I tried so far:
- SMC reset
- deleted power management plist
- deleted caches
- AHT - ok!
- safe boot
- second battery
- checked connectors inside
- disconnected fans
What could that be? My guess is the I/O-Board. Or could a malfunctioning logicboard produce such sounds?
Thanks!

Since computers should not be making crackling sounds, that would be a good candidate to backup all of your data and have the apple techs at the genius bar run some diagnostics to see what is not working right.  Could be a loose connection that does not show up on AHT.

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