Use your 1S Lipos on your MCP!!!

This is the MCP-X male connector wired to two (parallel) 1S Lipo Female connectors

Plug in two of your existing (and numerous) 1S Lipos and then place in your MCP

THEN charge with your stock MCP charger

Made small/short to save on weight - This particular one weighs .42 grams, yours will be very similar, but NOT EXACTLY .42 grams