If you pick the correct AH battery the VCE 150 can easily do 14 hours on one charge.
It all comes down to:
How many lifting / lowering operations.
How far is the truck traveling between & also up / down the aisles.
The weight you are lifting.
You can also get double accumulators on the higher lift VCE.
They have been around for a good long while now & BT have got the bugs ironed out, if there maintained & looked after correctly there pretty much bulletproof & will just keep on going.
How many machines are you looking to buy? have you asked if a demo VCE machine is available for a on site trial?
Are you going for wire guidance or guide rails?
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