Additional 2 cents from me.
As I mentioned before, the standard praxis here is - two batteries for shift work.
This is based upon the declarations from battery suppliers (Enersys/Hawker, Exide/Deta, Hoppecke), who claim, that the modern batteries with good automatic chargers with WiWa charging line can easily be used immediately after the charging process.
It's worthwhile to mention that the battery is about 30% of truck price, so multiplying this cost may seriously influence on investment parameters like ROI, NPV, IRR.
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