Re: couple of non related electronic questions
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Tonz, I think you're gonna need a bigger battery.
A spare might only be a SLA battery and won't like being depleted more than 50%. Probably in your case worth buying a Lifpo to avoid the hassles.
It will still need charging at the end of the day
As Russell states as long as they are all 12V it should run fine, its when you start introducing an inverter and mixed voltages is when you start loosing efficiency.
I thought Ipads and such used 18V-19V's which makes the conversion less efficient again.
In any of my conversions I like using large cap. lead acid deep cycle batteries.
Offgrid RV's for instance, any good 12V battery bank (s) should be able to supply enough power for 10X the usage per day.
Did you say you are using a Jackery (portable battery bank adaptor)
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