| 摘要 |
<p>A battery 101 has a memory 402 storing data identifying the battery type (NiCd, NiMH, alkaline, or Li-ion) and brand and also storing a multi-character message. The type and brand data and the message must match predetermined data before the battery can be used or charged, whereby only batteries which are known to be reliable and safe can be used or charged. A portable apparatus, particularly a portable cellular radio telephone, is powered by removable main and auxiliary batteries 101, 102 having respective memories 402, 410 storing such data. The apparatus is powered down if it detects that a battery with non-matching data is attached, and charging of a battery by an internal charger circuit 444 (or by an external charger) is terminated if the battery does not have the matching data. When the apparatus is in an operating mode it is powered by an external supply 430, if present. If the supply 430 is absent, the apparatus is first powered by the auxiliary battery 102 and then by the main battery 101 when the auxiliary battery voltage has dropped to a predetermined level. The charging circuit 444 first charges the main battery from the external supply 430 for a predetermined time at a regulated current, as determined by data in the memory 402. The auxiliary battery 102 is then similarly charged, followed by maintenance charging of both batteries. A controller 306 detects the presence of either battery 101, 102 by a voltage drop across respective thermistors 406, 414 therein.</p> |
