> Maybe you should be thinking cost per mWh > more than being concerned with waste? Or even I think what this made me realise is that reducing the battery voltage by using diodes can be more wasteful than is desirable, and that it's better to find a more appropriate battery. However, your point about about whether the customer will be truly inconvenienced by a "cost v performance" issue is noted -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads