Battery Advice and expansion

[SunEagle]

I found these batteries. Everyone seems to like them a lot. Duracell Ultra 6V SLIGC115 Deep Cycle Golf Cart Battery. https://www.batteriesplus.com/productdetails/sligc115

Well within my budget. I kinda like these and they're cheaper than the T-105's.

Those Duracell should work fine for your system but they won't last as long as the T-105's. Most times you pay less and you get less but your first set of batteries should be considered a Learning set and will not last as long as you hope.