Cheaper Lithium for FFS shuttl

[GSM]

Trying to piece together a FFS shuttle for ice fishing. Having a tough time getting past the battery prices at Scheels. I’ve looked on Amazon and online, but can’t find one with the same hookups/connections as the ones at Scheels. Anyone have any luck with some less expensive options? Going with Lowrance active target 2 since I have the screen already. Thanks