Grim,
Thank you for this very informative post. This for sure will be of help for me to get the most out of my rechargeables.
But after reading this I do have two questions.

1) if 50 % of the heat is generated when charging 80-100%, heating increasing exponentially with charge and then again I would guess that the "aging" would be increased exponentially with absolute temperature (according to the Arrhenius equation), why wouldn't we just charge up to 80%? Wouldn't that triple (or more) the battery life? Of course it would decrease the "capacity of each charge" but for most of my batteries it is the life time that is a problem rather than the capacity of each charge.

2) I thought that the speed of charging (charging voltage) and discharging was also an important factor in battery life? Naturally the temperature of the battery is higher during fast charging than slow charging. E.g. I had two chargers that worked for my last mobile phone, one had a higher voltage, charging much faster, than the other. I have usually used the slower charger to safe battry life (but of course the phone died after 4 years with the original battery in fine condition).