UPS for arduino

Projects General Guidance
1

Hello everybody,
I need to make a ups for an arduino - enet shield -router modem system consuming ~1A
I started with a 'smart' charger and a 9AH AGM VLA battery able to deliver a max of 3A which is perfectly enough. I also bought a 8-20V ->12V 5A which works very well

Now that I received the 'smart' charger I can tell it is not a good solution because it's fan runs even when displaying 'FUL' . Also, it says it should be disconnected when the battery is full

Can someone suggest how to do the UPS ? I am ready to add a uno to manage the charger with a code such as if Vbat< 10V apply a constant voltage of a constant current of such and such and Vbat> 13.7V stop applying external power

Thanks!

2

If you ignore that, does it work as a UPS?

3

something like this could help

4

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