You wont get as much punch this way... which you need in stock.
I recommend some re-planning for charging. What about charging a single pack tomorrow, while you're consuming some food at home. Then charge the rest during the race.
Schumacher Mi5 - Sanwa MT-4 / RX-462 / KO Propo PDS-2123 - Nosram 5600 X-treme Saddle Pack - LRP SPX Zero/X12 17,5 - Nosram Stealth Touch Evolution - MAAS SPS 9250