You need more money!
NIMH is false economy - you'd need a set PER RACE, and your 1800mah would be flat before the race is over (probably)
LIPO cost around £50 new from HongKong, and 1 pack will easily do to full meeting with top-up's between rounds (I did this for nearly 2 years with 1 lipo pack)
LIPO chargers can be had for £25 easily.
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