Adding a battery
I currently have a Renogy 12V 200Ah Rechargeable Deep Cycle Pure Gel Battery. I see that Renogy no longer sells this type of battery, and some Amazon and internet searches do not give me any promising results either. So my question is, can I mix other types of batteries with this? Or would it be better to start with all new type. And if a new type, what is the best, most affordable (no Li-ION for me) type to get. Thanks.