glow starter charger (for sub-c batterys)

Rather than charge the my glow starters battery, i thought why not charge the battery for it?
So i designed this, a small holder capable of charging a sub-c size battery with an rc car charger! As shown on the sides of this the end of the battery with the smaller contact is positive with the end of the larger contact being negative, also note that the positive side should have a groove around the circumference of the battery. Make sure to insert the battery the correct way, and to select the co