{"product_id":"maxell-er1733-replacement-battery-36v-1600mah-li-socl2","title":"Maxell ER17\/33 PLC Replacement Battery 3.6V 1600mAh Li-SOCl2","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMaxell ER17\/33 — 3.6V Li-SOCl2 Replacement Battery (ER17\/33)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 1600mAh lithium thionyl chloride primary cell. It replaces the Maxell ER17\/33 backup battery used in PLCs and industrial controllers to retain SRAM program memory and keep the real-time clock running when main power is removed. Capacity is 1600mAh (5.76Wh) as specified in the product data.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePLC memory backup application:\u003c\/strong\u003e\n    These cells share a common voltage rail requirement — the controller's SRAM and RTC circuits draw a standby current in the low-microamp range, and the Li-SOCl2 chemistry holds a stable 3.6V across that load for the full cell life without the voltage sag you get from alkaline or NiMH alternatives.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We measured open-circuit voltage before dispatch and confirmed the BMS-free primary cell construction delivers stable output with no internal protection circuit to trip under low-drain standby conditions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure — critical:\u003c\/strong\u003e\n    Always replace this cell with the PLC powered on and in RUN mode. Removing the battery while the controller is off will erase SRAM contents immediately — there is no grace period. If the PLC was off during the swap, a full program reload from your programming device is required before restarting.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePLC battery alarm not clearing after a confirmed good installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eMost PLCs do not auto-clear a battery alarm when the cell is replaced — the alarm flag is latched in the controller's diagnostic register and requires a manual reset through your programming software. On Allen-Bradley platforms, this is done via the fault reset routine in Studio 5000 or RSLogix. On Siemens S7 controllers, clear the alarm in STEP 7 or TIA Portal under the hardware diagnostics menu. Failing to reset the flag will leave the alarm active even with a fully charged new cell installed.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew ER17\/33 cell reading below 3.6V on first installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-SOCl2 cells ship in a passivation state — a thin lithium chloride layer forms on the anode surface during storage and suppresses the open-circuit voltage temporarily. Once the cell is installed on the PLC's float circuit and draws its microamp standby current, the passivation layer breaks down and the voltage rises to the rated 3.6V within a few hours. No action is needed if the initial reading is between 3.2V and 3.5V. If the cell reads below 3.0V after 24 hours on the controller, replace it.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415980605530,"sku":"BWCS-PLC269SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415980638298,"sku":"BWCS-PLC269SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415980671066,"sku":"BWCS-PLC269SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLC269SL-1.webp?v=1779758817","url":"https:\/\/batteryweb.com\/products\/maxell-er1733-replacement-battery-36v-1600mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}