I'm going to get a battery pack with charge-through and then try leaving the D1 in the new framebag. Hopefully with it charging the battery full time it won't get too hot?
Yup, if you're charging it causes the voltage to drop across the dynamo. At that point you'll have to be going really fast for the protection to still kick in. bertocq has managed, probably because within a 20hr sprint the device becomes charged.
I'm going to get a battery pack with charge-through and then try leaving the D1 in the new framebag. Hopefully with it charging the battery full time it won't get too hot?