yea.. there are no 7300mah NiMh's unless it is mislabeled.
I think the highest I've seen was 5000
depending on how you were driving it, on what kind of surface, and electronics setup it could vary drastically. But I'm guessing it has 20+ year old electronics in it due to the model... I would guess is a 1500-2000mah battery for 10 mins of runtime... or it is severely degraded, or out of balance.
If its out of balance it will give the charger false positives saying its full when its no where near it. Only real way to fix that is run it, let it die, and recharge it, and repeat. Each time it should get slightly longer. From what I recall my NiMh it took like 15 runs to get it to full capacity as when I first got it the thing would say it was done charging at less then half the capacity. Charger I have has a readout saying how much power it put into the battery. Granted its been 16ish years since I used a NiMh in a RC as I switched to lipo eventually.