SLA Batteries - Advantages over Wall Warts

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I've got a neat little wireless USB/SPDIF converter:
Pop Pulse - Product - Pop Pulse - PC-Link 24/96Khz Wireless USB Digital Transport

The power supply it ships with is a little noisy, so I have purchased a 12V sealed lead acid battery and wired it to the converter.

Are there any inherent concerns before powering on? I have read before (cannot recall where) that a soft start should be installed between SLA batteries and amplifiers - what is the reason (if any) for this?
 
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