My intention is only to use the block heater overnight, while the car is in the garage. I wouldn't need to carry it in the car. What I would need to do is carry it the 70 yards from the garage and up the 48 steps to my flat.
The mobile phone would work fine as I am up an hour before I use the car. Any longer for heating the block would need a timer, as 05:20 is the earliest I intend getting up!
A 50AH battery is big and heavy.
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