Upgrading T-Echo case

Hi everyone. I’m working on upgrading my LilyGo T-Echo using B8B8’s wonderful expedition case (thx again!).Does anyone have good recommendations for an upgraded battery (JST 1.25 connector)? The new case has a lot of space for the battery so I’m just looking for one that works, is reliable and can hold the most charge for field use.

Thank you

AMP