Tercels will run on the battery from a road hazard sign, no kidding! My 91 MR2 wanted a lot more though. A small battery would spin several times before starting where a larger battery would start it before you could let go of the key. I specialize in auto electrical systems so let me shed a little light. Most people don't know there are two grades of optima. One has the side posts closer together like the red one in this pic.
The other has these posts at the corners like this.
Of these two the top picture is the true optima. the lower pic is a second grade item with a lower price and lower standards. Make sure you get what you pay for as many crooked shops try to sell #2 at #1 prices.