Hello! I'm in the middle of a PORTABLE PS2 project. This modification will use three 18650 batteries of 3.7 and 2200mAh to make 11.1v and then regulate it to 8.5v directly to the power port of the PS2. It should be noted that it is a SCPH-90010. I will charge the batteries with a 2.1mm jack input. So my question is .. Can I charge the three 18650 batteries with a 5v 1a charger? That is, a smartphone charger? I would prefer that you respond here instead of redirecting me to the BitBuilt battery guide. Thanks, forum.