On my other site that I am on, they recomend 80% dod. So for 37v, no lower than 29v. What kind of chemistry, Lipo or Lifepo4?

Lipo recommend range 3.6v to 4.2...for battery extended life, charge to only 4.1v per cell

Lifepo4 recommended range is 2.0 to 3.6v, discharge to only 29v for longevity.