> On 17 September 2012 20:37, wrote: > Came across this white paper from TI today, on peak current draw from coi= n cells, and thought of the OP who was asking about such things here recent= ly ... > http://www.ti.com/lit/wp/swra349/swra349.pdf Very useful reference Main conclusions (read paper if these are of interest) Stated max currents of 15mA for CR2032 found to be conservative - 30 mA usually OK Loss in mAh capacity at 30mA compared to 15 mA is usually < 5%. Adding a capacitor is biggest improvement in most cases. Only Sony version managed labelled capacity at 30 mA. No name worst at about 50% but GP also low. Usually rated capacity is specified at << 30 mA. Russell --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .