Hey Lynx, what type of battery do you want to add. I recently replaced the 2 normal TM Batteries with 3 Lithium’s, by utilizing the fact that Lithium batteries can be mounted any direction even upside down if needed. I turned two of my lithium’s on their side and strapped them together into essentially a “Battery Block” that fit in the same space allocated for a single normal battery. Once I install my Panoptix / Livescope I will probably do the same approach for adding a 4th lithium just for electronics.
Ritt.
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