Functional Description

Battery and Charge Circuit

Onboard Battery

The onboard battery is rated at 3.6 v with a capacity of 650 mAH. The BBU has a DC-DC converter that converts the 3.6 v from the battery to 5 v, which is the nominal voltage needed to replace VCC if a power failure should occur.

Battery Charger

Battery charging and conditioning are automatically handled by the BBU. No manual preconditioning needs to be performed by the user. If the battery capacity falls below a predetermined level (which is likely to happen during a power failure), the battery charger goes into a quick charge mode. If the battery is fully charged, the charger goes into a trickle charge mode.

Recycling the Battery

The on-board battery that comes with the BBU has the logo of the Rechargeable Battery Recycling Corporation (RBRC) stamped on it. The logo means that recycling fees have been prepaid on this battery pack.

￿Caution

Do not dispose of a rechargeable battery with regular trash in a landfill. Rechargeable batteries contain toxic chemicals and metals that are harmful to the environment. Improperly disposing of rechargeable batteries is illegal.

Figure A-4. RBRC Logo

The RBRC is a non-profit corporation that promotes the recycling of rechargeable batteries, including nickel-cadmium batteries.

Information on the RBRC program and the locations of participating recycling centers can be obtained by telephoning 1–800–8–BATTERY (in the U.S.A.), and following the recorded instructions. The information obtained from this telephone number is updated frequently, since the RBRC program is growing, and new recycling locations are being added regularly.

A-8

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