Siemens BTX-2 — 55 amp-hour standby battery set, Siemens part number 175-083898, supplied as two batteries.
Siemens data sheet 3361 Rev. 4 lists the BTX-2 in the Details for Ordering table as the 55-Amp-Hour Battery Set, and the Dimensions drawing marks it 2 per Set at 12V 55AH each — the pair wires in series for the 24 VDC nominal standby supply a fire alarm control panel needs. These are sealed, rechargeable lead-acid batteries. Siemens is explicit that the sets are built by outside battery makers such as Werker, Johnson Controls, Yuasa and EaglePicher and sold under the Siemens model number, and that the stated amp-hours are minimum ratings, so a shipped cell may be rated higher.
- Two 12 V 55 Ah batteries per set; 24 VDC nominal
- 40 lb each battery
- 10.26 in. × 6.87 in., 7.96 in. high to the case top, 8.90 in. over the terminals
- Sealed lead-acid, rechargeable
- Mounts in a system enclosure or in a BB-55 or BB-55R battery box
Check capacity against your calculation before ordering: BTX-1 is the 33 Ah set and BTX-3 the 100 Ah set, and BP-61 is a single 15 Ah unit, not a pair. Note also that Siemens lists SXL panels with BT-33, BT-34 and BP-61 only. In a CAB-BATT enclosure the BTX-2 needs bracket CAB-55-BRKT.
