Specifications

Smart Battery Charger Specification
SBS Implementers Forum -Page 28- Revision 1.1
since it will no longer be receiving messages from the battery.) Second, the charger will monitor the
battery pack Safety Signal terminal. If the Safety Signal moves out of a range that allows “controlled”
charging, the charger will immediately terminate charge. This could happen if the temperature of the
battery pack got too hot, or the intelligence in the pack could force the Safety Signal to that range to
indicate an error condition and abort charging immediately.
These mechanisms are independent of and in addition to any protection mechanisms in the battery pack
itself, for example, fuses or protection FETs controlled by hard-wired safety circuitry.
Discharging
The Smart Battery System specifications also have a mechanism for the battery to request that the system
stop discharging it. If the battery detects that it no longer wishes to be discharged, it can send a high-
priority message to the system asking it to stop drawing power from it. The system should process the
messages and switch to another power source if available, or go into a low-power state if not. However,
there is no hardware mechanism to enforce the battery’s desire to stop providing power through its
terminals.