We think the battery will improve with time/more charges
your system is OK, run battery untill discharged, leave to cool and recharge, the NiMh batteries are much better than the NiCad we used to use, but most of us have moved on to lipo and lipo chargers (we have always used chargers that output 4amps plus and will charge in an hour from flat), bit of an investment for your mad rat, stick with what you have got for now.
You may see a bit more grunt from the larger battery.
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