the Back-UPS CS 350 and the Back-UPS CS 500, in both 120-volt and 230-volt models

Only units with serial numbers having the first six characters in the following ranges are affected:

* AB0048 through AB0251
* BB0104 through BB0251
* JB0125 through JB0251

Any units with an "R" at the end of the serial number are not part of the recall.

APC - Safety Recall: Back-UPS CS models in both 120-volt and 230-volt units.