Spare battery frame bag bargain option

[smokey_jo]

Instead of carrying your spare battery in your pack has anyone tried it in a frame bag? Just bought one of these PODSACS Waterproof Frame Bag so when my bike turns up I'll see how well the Shimano battery fits in it.

 

[smokey_jo]

Actually looking at the strap locations at the rear I'm going to struggle with it on the Vitus - Probably going to best for hardtails. Mine will come in handy for the touring bike anyway