We have a product that works from 7 to 12V DC at 100mA. One of our customers has asked us to supply him with battery back up for say 4 hours in the event of a power failure. I cannot find anything that suits apart from a UPS. Does anybody know of anybody that makes such a thing. Maybe has 9V DC power in wchich trickle charges a battery and also supplies load till power fails etc. I could make one but would rather buy of the shelf Thanks
Steve Jones