If you cut down the charge time you damage the battery. It's a fundamental limitation of physics. The damage is caused by physical expansion of the battery (and later contraction). The expansion is uneven and eventually wears out the film that separates the anode and cathode and develops pin holes (short circuits and sparks). The membrane is designed to lose ionic conductivity at elevated temperature and that spot becomes inactive by design and doesn't conduct electricity to protect the battery to prevent fire. Larger pin holes vaporize electrolyte, blows up seals, and causes a fire. That's why they don't want you to pack lithium batteries in checked luggage.