Jump starter real Ah may 25% of listed
11-19-22, 06:27 PM
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Pit Crew
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Jump starter real Ah may 25% of listed
Li-Polymer: Divide listed ah by 4. If you bought one listed as 20000mah=20ah, then at best there are four li-poly batteries in series, each battery is 5Ah,
and it may be have 4x3.7V×5Ah =74Wh, this value is greater than many laptop batteries. The capacity of a general car battery is 50-80Ah, or 600-960Wh.
so, 5AH batteries wants to start a car, can it work? I saw China has 50C li-poli but most on market might not. I expect them to be 30C so 20A one able to raise up 5A*30=150A.
at 30-50C discharge, it is common the life span is very limited, 10 times or 3 year? I don't know.
Supercap: no Ah available, they are not batteries, don't expect it can charge car battery or hold charge. Charging than use. Buy one with smart cable box, which has a relay and a alarm sound to inform you it is ready to crank. When hear it cranking asap. Wait too long, cap discharges.
Pb jump starter: battery can be 6ah to 17ah.
and it may be have 4x3.7V×5Ah =74Wh, this value is greater than many laptop batteries. The capacity of a general car battery is 50-80Ah, or 600-960Wh.
so, 5AH batteries wants to start a car, can it work? I saw China has 50C li-poli but most on market might not. I expect them to be 30C so 20A one able to raise up 5A*30=150A.
at 30-50C discharge, it is common the life span is very limited, 10 times or 3 year? I don't know.
Supercap: no Ah available, they are not batteries, don't expect it can charge car battery or hold charge. Charging than use. Buy one with smart cable box, which has a relay and a alarm sound to inform you it is ready to crank. When hear it cranking asap. Wait too long, cap discharges.
Pb jump starter: battery can be 6ah to 17ah.
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