Hi All, I have a phantom 2 and will be slowly buying more batteries for it but $ is an issue- are there any brands other than DJI? However, as I am planning on taking my phantom into the field for my archaeological work, I need to be conscious of weight. I was just curious if anyone has had luck with a portable charger or solar panel to help recharge batteries. I understand it would probably take longer than the hour from the wall charger, but I am often in the field for 7-8 hours so even if it took 3-4 hours a charge, I would still get to use it. Any advice would be awesome.