You could also use a resistive load such as a water hot pot, a heater (one without a fan) or a few incandescent light bulbs. I use a cheap heater that I converted for use as a defroster (installed a 48v fan) as it pulls about 15 amps at high heat setting.
I have used regular 100 watt light bulbs as well. Got to do something with them since the house now uses CF bulbs...
But I haven't had a need to load test the batteries in a while - I just check the miles traveled vs the amp hours used to charge the pack.
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