Can a Mac Portable battery be "trickle charged"?

At 10:44 4/27/00 -0600, you wrote: Two more cents worth: I've seen basically three types of chargers (or wall-wart power supplies.) At the cheap end are those using fairly high impedance primary transformers (with rectification and possibly filtering if DC supplies.) Better supplies contain a better quality transformer and a linear regulated DC output driver. The best supplies are the newer, high efficiency switchers. The cheap warts are designed to provide the rated current at the (approximate) rated voltage continuously. At a lower current, you get a higher voltage - it's all open loop. At a higher current, you get a lower-than-nominal voltage, but you also will get a premature burnout. These supplies are designed to self-destruct when the transformer core exceeds a rated temperature - burns out the transformer instead of burning down your house. In my experience, most of these DO NOT use a fusible link - they rely on the transformer primary opening. Those that do use a link usually bury it deep in the primary transformer winding. You will have to rewind the transformer to fix the open circuit in either case. For the linear and switcher type supplies, they usually just current-limit and/or shut down if you attempt to exceed the rated current. In the case of the cheap supplies, where the required current greatly exceeds the rated capacity of the supply, it will probably work for while and then the power supply will die. For the other types of warts, they will probably survive but the outcome of the charging is dependent on the circuit providing the battery drive - can it provide a proper charging voltage when operated at with a lower current supply? -Gary