Because I have 5 batteries and tend to cycle using them, none have yet reached the 20 charges point requiring a maintenance drain-down - though some have more charges on them than others. But two of the youngest batteries are suddenly unable to charge to 100% today, leaving the last LED blinking. One has eleven previous charges and the other only six. I have occasionally had to store them in the case in a very hot car (95+ temps outside) during my field assignments, but I can't see how that can be avoided -- unless I possibly use a cooler for future assignments. The other 3 older batteries experienced the same high temp environment but are still charging to 100 percent. Has anyone seen this problem before? I would upload my screen grabs but for some reason I am unable to upload photos to the site lately.