12V Accu Charger, Switch,...?

[Lord of nothing]

Hi
My Heater run on 12V for Control Device. There should be no power loss or the get into an emergency cooling mode after the power get "restored".
Can someone recommend an HW who can charge an Accu maybe good "old" Led Accid Accu who get use by an UPS?
When there is an Mains 12V Supply the should charge the Accu and deliver the needed power to the heater and when the Mains get cut (or I have to unplug them) the should switch like an UPS immediately to the Accu.
I dont know if some of the off the shelv think can do?!
Thanks

[Gregg]

I assume that the control needs 12V DC or is capable of using DC. 
For an off the shelf plug and play unit, Belkin residential gateway battery backup should work for you.
I have one for my internet connection that I found cheap on fleabay and purchased a new sealed lead acid battery for it.
https://www.belkin.com/us/support-product?pid=01t80000001zrPYAAY

[Lord of nothing]

  sound good but not sell in my Region.
I guess you mean something like this: https://www.eaton.com/de/de-de/skuPage.3SM36.specifications.html
Sadly I need something with more juice. The Heater need some power especially when the start up and the Glowplug run.

[Gregg]

The Eaton unit you listed shows the battery capacity as 2200mAh, which may not be enough time for your controller during an extended outage.  The website does show a run time graph which may tell you if it will work in your situation.
You might consider a DIY approach using a lead acid 12V battery and a power supply that can float the battery at 13.2V to 13.3V and occasionally raise the voltage to 14.5V for a few hours every couple of weeks.  A number of marine rated battery chargers use this method to keep boat batteries from degrading when not in use. An automotive battery that doesn’t have quite enough capacity for winter starting could be repurposed in your situation giving days of backup.