2 x AAA

2 x 3.7v 100mA solar cells in parallel

Launch 1 was on 15/12/12 - unfortunately on releasing the payload it did not have enough lift resulting in it dragging across the fields and getting caught in a tree 2km away, max altitude was 101m. Was recovered the next day (still transmitting).

Need to take in to account that lifting gas might cool once outside and lose lift, may require a little more gas before launch.