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I think some people get confused with "xenon" filled bulbs
A xenon HID bulb has no filament in it I believe, and it ignites the xenon gas inside to create the light.
A xenon gas filled bulb is just like a normal filament bulb but has xenon gas inside instead. Marketing b****cks to make them...
I doubt it mate as a headunit will pull much more current than a camera.
Just stick another feed to your 2nd headunit straight from the battery (fused of course), and then take a switched live to it so it turns on and off at the same time as your screen
I had a battery from euros fail within about 3 months, so I wouldn't rule it out.
I've got a battery tester and even after it being on charge for nearly 12 hours, the battery couldn't give more than 10ah
Typically I'd thrown the receipt away though, so had to buy another