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Main power is actually shortened with powerbank charge (look at the diagram) The reason you need tho relays (or one DPDT relay), is that you need to isolate powerbank and power out to the dashcam. When main power (USB cigarette adapter) goes down, power out not only has to be switched to...

I've made a UPS using 5V power bank (the one used for charging cell phones on the go) and couple of 5v relays. Some DIY required, but it's fairly simple. Here are some instructions blog.nagimov.com/uninterruptible-5v-usb-power-supply/ I've spent total of around $20 on it (reused my own power bank)

I use this thingy (similar to what lacibaci done): Eight bucks from amazon :D

Get a cheapest USB cigarette lighter adapter ($2 from dollar store). It has decent DC-DC converter, plus you'll get a USB port. They're fairly intelligent (even the cheapest ones) to filter 12V noises

Anyone tried plastic film polarizers from dead LCD monitors? Something like this http://www.instructables.com/id/Privacy-monitor-made-from-an-old-LCD-Monitor/ My dash reflection is pretty terrible sometimes...

gotcha, removed repeated replies (they were in different subforums tho! :)

I've been driving with my DIY uninterruptible power supply for my Xiaomi YI for quite some time now. Even though the solution seemed so obvious and easy for me, I found it's a rather big problem for dashcam owners (people go crazy with 12V batteries, ridiculously expensive BlackVue power packs...