I've read a lot about problems with the life of these Lithium Ion batteries and would like to ask a couple questions and get some feedback: First...has anyone found out WHY these seem to suffer short lifes (many times it appears a year or less) even when used in a "Homeowner" type use pattern? I was wondering if it could have something to do with the rather "Quick" (15 minutes) charging sequence Makita uses with these and if so is there a way to charge them slower? I have several of these tools using the slim 1815 & 1830 battery packs so I'm very interested in this and sorry I didn't see more about these problems BEFORE I purchased them. DEWALT apparently has a much better track record I'm reading. I also keep my tools and batteries in my garage and have wondered whether the cooler temps (40 degrees is lowest temp they would experiance) are bad for the batteries when considering charging and storage... so if anyone knows the answers to these questions or has other info/advice about it...I would greatly appreciate the feedback. Many thanks in advance!