This is all well and good, I know battery performance very well, I know solar very well but what about the many unsuspecting newcomers that don't, its for them not I. I guess ZWO just forgets about those although they are one of the main target audiences in this new end of astronomy. Remember the old saying ' take their money and run ', lol ! As to my temps, in my world we get -45° C on some nites but I don't do astronomy below -15° C any more but when it comes to lithium batterys I know what to expect, I am a long time expert as well, lol ! But I care about those that aren't, not like many and I won't say anymore. As I said up above ' I give up ', lol !