got tired of playing with lead acid batteries on the TM. Running out of power in five hours leaking Which is my biggest peeve. Heavy and messy. Well, the lithium batteries came down in price so. I waded lout the pros and cons. Decided it was worth it so I bought 2 31’s lithium deep cycle batts. They have everything but Bluetooth. After research it is suggested not to run power over 8.5. Due to burning up the armature’s in the trolling motor. Quest brushless doesn’t have this problem I guess not 100% sure. Charging now looking forward to putting them to the test, especially on the Columbia river trolling for salmon🤑🤑🤑