GoPro Hero, External LiPo power
I recently tried my hand at making a timelapse video using the GoPro (http://www.youtube.com/watch?v=rO3IPMI9TEI) video and still image functions. I was a bit disappointed with the battery life and because I didn't have a spare battery, or access to power the device via a USB charger.
I needed a portable power supply to plug in via USB port on the side of the GoPro. To this end I took a UBEC, hooked it up to the balance tap of a 3S lipo and the output to a USB cable. In the photo below, I added the HK Wattmeter to see if I could measure any current draw by the GoPro. The lowest resolution of the Wattmeter is 100mA and didn't register.
Next to do is maybe add a voltage detector so I can leave it running and get an audible warning if the LiPo gets low however I hope a 2650mAH battery will outlast a 32GB SD card in the camera. I'll have to hook up a proper multimeter and measure the average current draw and figure out how long batteries might last. Maybe integrate a low voltage cut-off circuit as well.
Multi charge leads
I was charging an 800mah 2S battery via the JST connector on my multi-charge lead. After the charge was finished, I went to unplug the battery and dragged it toward me over my bench, when the lipo started fizzing and smoking. I suspect the Tplug that wasn't in use at the time shorted out on a pen clip. The effect is as good as shorting out a Lipo across it's terminals.
The terminals have melted and the lipo has puffed so I've junked the battery. To avoid this in the future, I took an unused T connector and covered the terminals in silicone. When you look at all the leads on the harness, if a short is going to happen, it's going to be on the T connector with those exposed terminals sticking out.
Silencing the Swallow 2 AC/DC
The buzzer on the Swallow charger is very good at it's job of alerting me to when the battery is finished charging with a very loud BEEEP!. The problem is, I have a 6 month baby girl trying to sleep half the day in an upstairs bedroom. You should see the looks I get from the wife when this thing goes off.
I've tried containing the noise by putting it in a metal filing cabinet and closing the drawer but the sound still gets through. So I decided to remove the buzzer from the board.
I'm sure I have voided my warranty but now I can charge batteries to my hearts content without waking anyone up 