They both have about 1800MaH's of useable charge and still run my 3:1's as fast as ever (even faster with the 2.4). Remember, they've been on ice for 7yrs and all research says age has no effect, only charge cycles. I'm guessing you have not seen these new wave 4:1 gearboxes in person and just how slow they are, but I can assure you the low end performance is incredible and addictive. The Li-ion that came with the Leo performs exactly the same as my NiMHs.

Anyways, it's on my to do list, but not a rush.