[Android Head-Units] kaween:
Correct. And that's why I like TC more. When you attempt to do anthing that is not allowed by the FS permissions, it will notify you of the issue, and simply ask if it should make the necessary adjustments to fascillitate the action. Simple "yes" or "no". Ready.

For some odd reason, I've had droid phones who still would gladly allow RW mounting, yes when trying to copy with RE they would still fail at FS permission levels. TC notifies the user and takes the appropriate actions itself after asking the user. :good:

---------- Post added at 06:34 PM ---------- Previous post was at 06:17 PM ----------

"Some of you". Well, that's me I think.

But it is NOT simply a battery pack. I'm using a battery (Sealed Lead Battery, 20Ah 12V) and the Pico-ups you can find here : h t t p://www.ebay.com/itm/PicoUPS-120-12V-DC-UPS-10A-Charger-included-Cyncronix-/190400962504

The picture is self-explanitory : I've connected the INPUT of the ups to the 12V Switchable (typically the "red" powercable of the car), the 2 leads "to battery ...." well, no prizes there, those go to the SLA with the power of your choice.

The output of this, I've connected to BOTH ACC and BAT leads of the radio.

Functionality becomes this :

1) the pico ups acts as an autoswitch and feeds the car with whatever powersupply is at the highest voltage level. When you crank your car or the alternator is not charging your car, the backup battery will be higher in voltage than the rest of the system. Switching happens within 100ns I think, you radio does not "see" this interruption.

2) when your engine is running, the voltage level of the car will be around 13.7V or higher, thus the radio will run over the main battery of the car, AND the assisting battery will be charged.

3) if the car is shut down and the key is pulled, you CAN switch on the car radio as it will be fed by the backup battery. Whenever you would exhaust that backup battery, it will NOT drain your main battery as the pico-ups switch does NOT permit that the backup battery is charged below 12.5V. So there's no risk that your mainbattery will be drained empty by a backup battery that is empty, as the backup battery can only be charged if the input voltage of the pico-ups is above 13.5V (in other words, when your car battery itself is being charged).

Downsides : the load 'in this case the radio' can NOT switch off automatically when you switch of the enigine and pull the key.

Upsides :

1) no interruption during crank

2) possibility to let your radio play even with key pulled, without the risk of draining your main battery.

3) clean and simple system, very easy to install, very cheap.

Just how big you the backup battery must be depends on what you want. If it's just to bridge the crank of the engine, a small 7Ah is more than sufficiant, and it will allow to play the AN21-U for somewhere between 60 and 90 minutes without main battery support. The combination of the pico-ups and a 7Ah 12V is small enough to find its place somewhere behind the dash, and in most cases even in the 2din opening left or right. I've put a bigger battery in my booth as I tend to play the radio for a couple of hours without engine running when I'm working on the car in the summer, but also I've added a 12V socket in my booth that can power external devices without me having to worry about getting my car started the day after. The Pico ups can charge batteries up to 60Ah I believe, so basically if you had the space, you could add a 2nd battery in your car that you can use to JUMP START YOUR OWN CAR without any other car in the vicinity when the primary battery is depleted. How cool is that ? :)

Note : please do not forget to add an extra fuse to the "new power circuit" coming from that extra battery. The Pico-UPS itself has a fuse too, but I wouldn't trust JUST that fuse.