Hey folks. I called Trinity who has recently been purchased by Horizon Hobby. The TEP2310 and TEP2319 aren't on the website and aren't available through Horizon. Horizon looks to be replacing the TEP prefix with a TRI prefix. I left the conversation more confused then when I went in. I ended up going SMC:

https://www.smc-racing.com/index.php...product_id=723

It has the correct dimensions (which don't vary) and seems to have SMC's highest C rating. It also supports 5C charging which puts us in 30+ amps although it says it will reduce the life of the battery. At $60 this is a risk I am willing to take.

Surprised how hard it was to find Trinity batteries and how confusing their models and part numbers are - I guess with the purchase of the company they are in flux.