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What capacity do you want the booster pack to be? If you want it to be portable, like you take it out and charge it inside, it can't be very big or heavy. The stock pack i guess is at least 50-60 pounds. If you want to double the capacity you'd need lithium if you want to take it out regularly.
If not a regular 120 volt extension cord might be best plugged into a regular wall outlet both at home and at work.
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I try to be helpful. I'm not an expert.
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