Introduction I know very little about electronics aside from how to shock myself... Therefore, I credit G. Forrest Cook and his WEBSITE for providing me with the general instructions for the electrical assembly. Thank you Mr. Cook! I also got some charging time estimates from a few CPF members on THIS thread. Thank you CPF members! Now, on to the project. The Watertight Box I found these watertight containers at my local Gander Mountain for about $10. They are intended for carrying fly fishing hooks. I removed the grey foam that they came with to make space for the charger parts. The Solar Cell Although Mr. Cook did not use this solar cell on his project, he did suggest that it would be a very good candidate. I am referring to the Electronix Express model #08SLC07, which is 5V 60mA solar cell shown toward the bottom on this Product Page. Two nice features about this solar cell are that it is laminated to a PC board and includes a diode. The diode prevents the batteries from discharging back into the cell when in the dark. As you can see in the third photo, I have used a double layer of double-sided foam tape which will be used to attach the cell to the inside lid of the box. It was necessary to use a double layer of the foam tape so that the cell would set high enough off of the mounting surface to provide room for the diode, the terminals and the wires. The Battery Holders & Batteries For battery holders, go to RadioShack. I think they were less than $1 each. For batteries, I needed to meet the minimum purchase of $20 at Electronix Express, so I bought the batteries through them at $3.50 each. Yes, I know I probably got raped at that price, but it did help meet the minimum purchase requirement. The plus side of that is that these are low capacity nicad batteries rated at 1.2V 700mA. According to the folks over at CPF it is a reasonable estimate that, with the solar cell I chose, it would take approximately 12 hours of solid sunlight to charge 2 AA batteries. If I were to use high capacity 2500 mA nimh, it would take approximately 42 hours of solid sunlight to charge 2 AA batteries. My charger is set up to charge either 2 AA batteries or 4 AA batteries at the same time. If you were to charge 4 AA batteries at the same time, then you could double those time estimates... My thinking is that one would most likely be "topping off" batteries that are "not quite dead" as opposed to charging batteries from a completely dead state, so I feel that this charger is adequate for my needs. Please note in the first photo that the battery holders from RadioShack do not include the double-sided foam tape. That was added by me for attachment to the interior of the bottom of the box. The Schematic Diagram Don't ask, I barely speak the language... But, the diagram should be accurate. The Final Product It folds shut without any danger of crimping any wires and it's watertight. The batteries remain in thier current state of charge untill needed. I'm happy with it and I'll try to answer any questions that you might have. Just keep in mind that I'm not electronicaly inclined. Thanks for looking, Dan PS. Here's a sneak peak at all the other "modular components" of my bug out bag made from the same watertight boxes from Gander Mountain.