I am making a solar charger for 3 AA batteries. I have two 6 volt 100mah solar panels. Will it be more beneficial to connect them in parallel to have more current or in series to increase the voltage? The voltage of the 3 AAs will be at least 3.6 so I am wondering if there will be enough potential difference to charge them. I am aware that this charger will be slow and I will make sure that the batteries do not overcharge. They will probably be 1300mah 1.2 volt rechargeables. This is the solar panel: http://www.ebay.com/itm/301018398863?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
(In this case) you're better off putting them in parallel - your batteries will not rise to 12V.
With the solar panels in series you will also have other issues. Imagine that one of the panels does not receive sunlight - it would generate a low current and the other panel would generate a high current - I do not think that the low current panel will be happy with the high current of the other one.