Try Lifelines and a charging system big enough to deliver the goods. 13.9 volts is not 14.4 volts. Read It Again, I fully and totally recharge my lifelines with a time limit of 4 hours and change.
When people splay out a carelessly made claim without caveats it is sad and makes everything else they spout, suspect. The Lifeline indeed charges 5X faster. Hong Chow specials don't stand a chance of doing that despite their paper thin plates.
It's the BS factor. No one wants to discipline their comments. Download the Lifeline manual and read reality not regenerated BS. I have duplicated Concorde's claims in everyday charging time after time. It takes one hell of a charger to maintain 100+ amperes at a steady 14.4 volts.