{"product_id":"allen-bradley-1756-ba2-battery-assembly-controllogix","title":"Allen-Bradley 1756-BA2 Battery Assembly ControlLogix","description":"\u003cp\u003eConfigured for volatile memory retention and RTC backup in ControlLogix chassis, the \u003cstrong\u003eAllen-Bradley 1756-BA2\u003c\/strong\u003e (also cataloged as \u003cstrong\u003e1756-BA2\u003c\/strong\u003e Battery Assembly) supplies 3 VDC from a 1200 mAh lithium cell to 1756-L6x Series B processors during main power loss.\u003c\/p\u003e\n\u003ch3\u003eCatalog Identity\u003c\/h3\u003e\n\u003cp\u003eThe 1756-BA2 is the lithium backup battery assembly for ControlLogix L6x Series B and compatible L7x CPUs. The \/A suffix denotes the released hardware revision. It is not interchanged with 1756-BA1 (L6x Series A) or 1756-BATA. No configuration jumpers or daughter boards exist.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1756-BA2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.02 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e3.5 x 1.8 x 1.8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to +85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd\u003e3 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e1200 mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Chemistry\u003c\/td\u003e\n\u003ctd\u003eLithium (Li-SOCl2, non-rechargeable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible CPU\u003c\/td\u003e\n\u003ctd\u003e1756-L61B \/ L62B \/ L63B \/ L64B \/ L65B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003ePolarized keyed plug, red\/black leads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eController side battery bay, horizontal seat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Power Isolation \u0026amp; Firmware Lock\u003c\/h3\u003e\n\u003cp\u003eThe 1756-BA2 draws no current from the 1756 backplane 5 VDC or 24 VDC rail; it is electrically isolated behind the processor's internal switching diode and ESM capacitor bank. While the CPU is energized the battery sits open-circuit. On VAC loss the cell backs up SRAM and the real-time clock only. No firmware, no EDS, no backplane scan impact. I\/O density and communication velocity of the ControlLogix chassis are unaffected by battery state. Hot-swap is permitted only while controller power is present; the onboard capacitance covers the milliseconds of connector disengagement.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x 1756-BA2 Lithium Battery Assembly with lead and polarized connector\u003c\/li\u003e\n\u003cli\u003e1 x Date label sticker\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eController Bay Integration\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCPU Match\u003c\/strong\u003e: Insert only into 1756-L6x Series B processor battery slot. Series A requires 1756-BA1.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLive Swap\u003c\/strong\u003e: Keep controller powered during replacement; removing battery on dead CPU loses user program and tag values.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrientation\u003c\/strong\u003e: Seat horizontally with arrow mark upward, connector fully latched.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisposal\u003c\/strong\u003e: Treat as lithium primary cell; do not incinerate, recharge, or discard in standard steel waste stream.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1756-BA2 charge while the controller is powered?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The cell is a non-rechargeable lithium primary. The CPU provides reverse-current blocking; no charge circuit engages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat triggers the processor BAT LED?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen cell voltage decays past the threshold, the CPU sets minor fault type 10 code 10 and lights BAT red. Replace within the window while power is maintained.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan 1756-BA2 be used in an L7x without an ESM?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eL7x controllers ship with 1756-ESMCAP supercap module pre-installed. BA2 is still supported as extended backup but is not the primary energy store on L7x.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs backplane current budget affected by battery fitment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eZero. The assembly never loads the 1756 chassis power supply. Backplane 5 VDC\/24 VDC sums exclude this part.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the data retention time at 25 deg C?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRockwell quotes roughly 5 years idle retention at 25 deg C after a fresh install. Above 40 deg C cabinet ambient, expect accelerated self-discharge and shorter interval.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan BA2 and BA1 share the same connector footprint?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePhysical plug shape differs by keying. Forcing a BA1 into a Series B bay or vice versa risks polarity mis-seat and controller-side diode stress.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes removing BA2 reset the RTC?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf main power is also absent, yes. With VAC present, RTC runs off controller clock circuit and battery is bypassed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre there slot restrictions in the 1756 chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBattery lives inside the processor module, not a 1756 I\/O slot. The \"7 slots\" figure in distributor listings refers to chassis size compatibility, not battery occupancy.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066412060845,"sku":"1756-BA2","price":299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/1756-BA23.jpg?v=1785141181","url":"https:\/\/www.maxwellplc.com\/ru\/products\/allen-bradley-1756-ba2-battery-assembly-controllogix","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}