Operating fish finder using lithium battery

[BearLakeFishGuy]

All those Li batteries are probably made in the same factory and have different labels or outside cases. If I were to switch to Li, I would buy the cheapest one from a reputable store or on-line store, so you can return them. Wal-Mart is my go-to since they are pretty hassle free when it comes to returns on just about anything. I saw several Li batteries on line for about $179/each for 100aHr or better.