Looking for an APC CS 350 battery? Then you've come to the right place. We have been selling batteries for APC CS 350 UPSs online since 2003 and will have the correct battery for your UPS in stock, available for next day delivery. Use our APC CS 350 battery guide below to find a suggested battery for your UPS and compare it to the battery fitted to your CS 350. Need help? Simply contact us.