Sterling SDF 250 - Manual (Page 50)

SDF 250/400/500
Maintenance 5-13
Close the control box.
L
Store backup batteries in a dry and cool place.
Backup batteries can be stored for approx. 5 years.
If backup batteries are not treated properly, they can ignite,
explode and cause severe burning.
&
Order number battery: ID 83809
Batteries must be disposed of in keeping with the relevant
national environment protection regulations/guidelines.