On Mon, 26 Jun 2017 21:22:36 -0000 (UTC)
Martin Gregorie  wrote:

> Using an in-line 6 or 12 v SLA (Sealed Lead-Acid battery) together with
> an off-the-shelf battery charger plus something that outputs constant 5v
> when driven by the battery is probably the easiest DIY approach.

 A car USB charger is quite a good option for the "something",
easily available and cheap - either open up the case and wire it in, fix
wires to the plug or even get a socket for it.

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