Battery backup for home project

[chrisrpriceuk]

Hi all,

I've got a bit of a home project on the go that is being supplied power from a 12v 7ah Lead acid battery.

The project itself runs at 5v 3a so I have a UBEC connected to the battery first switching the power down for me. It can handle an input voltage of up to 23v input. Apparently it draws around .5Ah

There is one other device connected directly to the battery that can accept 7.8v > 16v drawing 10Ma.

What I want to do is to keep the battery charged all the time whist it's still powering the project so that if the mains power were cut it keeps running - like a UPS.

Can anyone advise me on what I need to do / get in order to do this?

Your help is much appreciated!!!