Homemade low temperature cutoff

I'd like to believe I don't need heating, but don't want to trash $600 worth of batteries.
Renogy is a brand label on a 200Ah battery sold by many vendors. Its perhaps this battery,
An internet search will pull up many venders for this or very similar battery.

I am in the UK , this seller offers a similar battery , this is the data sheet,
Is is almost the same as the Renogy specification and gives the same conflicting information. It may be a 'lost in translation' issue from the original Chinese specification sheet.