| The intelligent charging system shall comprise a charger and two dedicated battery packs. The charger shall feature a rugged plastic case with two multifunctional charging receptacles for charging the WMS 4000/4500 transmitters, the SPR 4 or the dedicated battery pack. Each charging receptacle shall accept either a handheld transmitter, a bodypack transmitter, or the dedicated battery pack and it shall be possible to charge any combination of these devices (e.g., an HT 4500 and a battery pack). The battery pack may remain inside the transmitter during charging. The charger shall use high-tech, microprocessor-controlled charging circuitry with trickle charging, automatic shutoff at the turning point, and 2-stage overcharging protection. The charger shall automatically check whether the transmitter is on, switch the transmitter off, and charge the battery pack. A bicolor LED shall indicate the charging status at any time, and the typical charging time shall be one hour. The dedicated battery pack shall use an internal RAM to communicate with the charger and control the exact amount of charging depending on the ambient temperature and evaluated data received from the integrated self-discharge counter. The charger shall automatically detect the need for a recovery cycle to minimize the memory effect of the battery pack. The charger shall provide a warning LED to indicate this situation and a key for manually starting the recovery cycle. The typical duration of a recovery cycle shall be 14 hours, the useful life of the battery pack approx. 1200 charging cycles, and the typical battery life per charging cycle 12 hours. The charging current shall be 1.2 A and the operating voltage and current 12 VDC, 1.3 A. The size of the charger shall be 92 x 173 x 85 mm, its weight 580 grams.The size of the battery pack shall be 30.2 x 57.5 x 18 mm, its weight 70 grams. The charging system shall comprise a charger and two dedicated battery packs. The charger shall be the AKG CU 4000, the battery pack the AKG BP 4000. |
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