[vkuruthers]

Thanks @vibrolax, that does look ideal. I was going to muck around and design the circuit myself (hopefully based off a solid reference design), but the COTS setup you listed above looks just like what I need, so I think I'll go ahead and get it once funds allow :) Thanks again for the tip.

[vibrolax]

You're welcome. Another possible solution for you is a dc-dc laptop brick like these: https://www.powerstream.com/ADC-p006.htm.

Fit your gel cell with an auto accessory socket, then plug in the power supply.