One issue with the emergency boxes is their cranking amps often being low. The trick to that is you use it to help recharge the main by leaving it attached for five minutes or so before cranking. That puts some of the energy into the main and means the portable does not have to flow quite so much.
If you can, get one that can stay plugged in with automatic control. Many are just a simple charger and can have a shorter life if they stay plugged in.
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