Note: The model 441 battery backup pump is getting an upgrade to the charger. All 441’s and PC-Series with 441’s will be receiving a 1.5-amp charger instead of the 1-amp charger currently used. This is a 50% increase in charging capacity. Also, the new charging unit mounts to the wall and has a power cord that goes to the 115V outlet. The old charger plugged directly into the wall outlet covering both sockets and rendering the second outlet unusable. All functionality remains the same and new chargers are backwards compatible for replacement and service of existing systems in the field.