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There is no reason you cannot parallel the batteries, they will just sit at the lowest full voltage of the weaker one. Ideally you should start with new batteries from the same product line and design, but it will work.
As far as dropping the panel output, which is often shown as open circuit values btw, the best approach in my opinion would be a simple, safe, and very cheap solar controller box, which you can find on ebay for about $10.
Good luck.
Btw, those 5W micro chargers are pretty useless, their output is very small. A small cheap controller box will allow you to use a proper solar panel to charge and it will quickly recharge any drain. Some solar controllers provide a fused output to the load side. Why connect a charger to recharge then between uses when they can be wired to charge constantly. MPCC controllers allow you to set float values or use default values. Output protection features will cutoff to prevent over discharge and thus protect the battery and extend its life. I never discharge my bank below 12.5V.
Last edited by glend; 05-03-2017 at 02:28 PM.
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