Recommendation and talk seems to say always take off with 100% battery charge.Just wondering what would be your normal procedure in a case like this: You have 3 houses to photograph: You took off with a fresh battery at 100%. For the first house your battery went down to 68%. At the next house do you swap that battery out and start with a new 100% charge, or do you take off at 68% with the original battery? I assume if you went below 50% you would automatically NOT take off with a battery that low. But what about other % ?