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Higher nominal voltage vs. Motor

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Hi all,

For my Isetta build, I'm going to be running a pancake PMDC motor, rated at 48V nominal.

It's going through an Alltrax 72V 650A controller.

My question is, are there any issues with me using a battery pack that will have a nominal voltage of 72V, rather than one that's at 48V?

I assume that the controller will just reduce the voltage the motor sees if I limit it (I don't need the additional RPM/speed from higher voltage), but thought I'd check in case there are any issues or significant efficiency losses with this...

Thanks!
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