Battery Packs 738 and 737 Providing battery backup in the event of loss of incoming power, the Battery Pack 738 offers 24VDC at 5A per hour and the 737 offers 12VDC at 5A per hour. BENEFITS Battery Pack 738 used with 3520, 3540 and 3570 24VDC Power Supplies Battery Pack 737 used with 3521, 3541 and 3571 12VDC Power Supplies Feature sealed lead acid batteries Downloads Electroguard Catalog Installation Instructions Request Information Discuss your needs directly; fill out the form below. loading Interested in this product? Contact Us Related products 3521/3541/3551/3571 12VDC Power Supplies Timer Model – TMR9 Release Hold Timer 3520/3540/3550/3570 24VDC Power Supplies