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When it comes to charging a super-capacitor there are two golden rules, the capacitor should be charged with correct polarity and with a voltage not exceeding 90% of its total voltage capacity. Super-capacitors in market today are normally rated for 2.5V, 2.7V or 5.5V.
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But because of this capability of handling high current, a super capacitor should be charged and discharged safely to prevent thermal runaway. When it comes to charging a super-capacitor there are two golden rules, the capacitor should be charged with correct polarity and with a voltage not exceeding 90% of its total voltage capacity.
1) You must never charge past the capacitor voltage rating. If you have a 2.5v super capacitor, you must NEVER charge it at a higher voltage. If you do, you risk damaging the integrity of the capacitor, or worse, an explosion. Personally, I never charge past 80-90% of the rated charge.
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