Chris McSweeny wrote: > If it helps at all, the spec I have which I might not have mentioned befo= re > is that the kit has both an external battery and an internal battery. If > the external battery is left plugged in it will completely run down and > never switch to the internal battery. If you unplug the external battery > when it is almost run down, then it will switch to the internal battery s= o > resulting in another 24 hours of runtime. My friend is after a way to > automatically disconnect the external battery in the same way as unpluggi= ng > it does when it drops below a certain voltage. Though I don't think that > level of detail makes any difference to the question. Sounds to me like either the external battery pack does not meet its published specification=20 regarding cut off at low voltage - cause for concern OR the external battery connector on the device has a mechanical switch=20 to disconnect the internal battery while any plug is in situ. George Smith --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .