An Anker
Or similar portable recharging device(s) (plenty of brands available) should be a must have for keeping kit such as tablets / phone alive.
As for laptop, ensure model used has easily irremovable battery, take a (charged) spare laptop battery.
.. Obviously all kit should have been fully charged the night before anyway, so a couple of hours of no leccy should not be too horrendous
6P
Biting the hand that feeds IT
