Will I be disappointed with NiMH?

Copied from the ES:

Lightly used and in good health for $200.00. Is this a good deal?

Not by a long shot. 36V/9Ah works out to about $0.61Wh, and thats BEFORE peukert. After factoring that in, I come to about $0.88Whr. That's getting into low-end LiFe prices.

Thanks for all the thoughtful replies. It seems that everyone is leaning towards the Lfepo4 batteries. But is a 9ah nimh going to be good for me? Is it going to be really set back on any attributes (power, distance, etc?)

It would be better than a 9AH SLA, correct?

The Ampedbike kit will only pull a max of 20 amps going uphill, according to Danny. Will the Giant Battery perform for this requirement? I've read that some batteries just can't do it!

Not if you get decent Ni. Good NiMH/Cd will do 5C or more, meaning that even a 10Ah pack will be able to handle a 50A controller. Thing is, decent Ni will cost you about the same as LiFe.

Since you only need 20A, though, this 36V 15Ah battery from Ping will handle that and should be able to go at least 15 miles. 20 or more if you pedal.