Originally Posted by beerassassin
next I tried a 70mAh 25C lipo. to my surprise the recording only lasted 40sec before the camera shut off. the battery voltage after was 4.14v.
If you have a multimeter, hook it up and watch the voltage with the camera running. I would guess the voltage is dropping under load, causing the camera to shut down. Is it a new Lipo? If not be aware that these small cells 'age' pretty quickly ... I've just had to throw away a bunch of 70/110/120s that charged fine but would no longer deliver any useful current.
I'm always a bit doubtful when I see ratings like '25C' applied to tiny cells. Would a 70 mAh really
give 1.75A continuous current for over 2 minutes?