{"product_id":"irobot-looj-125-replacement-battery-72v-3600mah-ni-mh","title":"iRobot Looj 125 Replacement Battery 7.2V 3600mAh 14501","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eiRobot Looj 125 \/ 135 \/ 155 — 7.2V Ni-MH Replacement Battery (14501)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.2V, 3600mAh Ni-MH replacement battery for the iRobot Looj 125, Looj 135, and Looj 155 gutter cleaning robots. It matches OEM part number 14501 and slots into the same bay as the original pack. The Looj's auger motor and drive system pull directly from this cell stack during operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLooj 125, 135, and 155 compatibility:\u003c\/strong\u003e\n    All three models share the same 7.2V Ni-MH cell configuration, battery bay dimensions, and connector pinout. The same pack runs across the full Looj lineup because iRobot kept the power architecture consistent between generations.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through repeated auger-load tests. The BMS held voltage steady under drive motor start-up current and recovered cleanly after sustained resistance from debris simulation. No premature cutoff was observed during normal gutter-pass workloads.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eLooj storage between seasons:\u003c\/strong\u003e\n    The Looj typically sits unused for months at a time. Store Ni-MH cells at roughly 40–60% charge between gutter seasons — a fully charged Ni-MH pack left idle for months self-discharges faster and can cause the charger to read the pack as faulty on the next use.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Looj auger slows or stalls before the battery indicator drops\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH voltage sags under heavy auger load even when cell charge remains high. When the Looj hits a compacted leaf dam or wet debris, the auger motor draws a spike of current that temporarily drops cell voltage below the drive circuit's operating threshold. The robot reads this as a load fault, not a battery fault, so the indicator stays green while the auger loses torque or stops. A replacement pack with full cell capacity handles these load spikes with less voltage sag and holds the auger at working speed longer.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLooj won't start after sitting all winter — even on a full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA Ni-MH pack stored fully discharged for several months can drop below the charger's minimum detection voltage. The charger sees a pack that looks dead and refuses to start a charge cycle. This is a BMS re-initialisation issue, not a charger fault. If the replacement pack also shows this behaviour after storage, connect it to the charger for at least 30 minutes — some chargers require a resting voltage of at least 5.5V before the charge cycle triggers.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428058595418,"sku":"BWCS-IRB155VX-1","price":67.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428058628186,"sku":"BWCS-IRB155VX-2","price":78.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428058660954,"sku":"BWCS-IRB155VX-3","price":86.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IRB155VX-1.webp?v=1779934036","url":"https:\/\/batteryweb.com\/products\/irobot-looj-125-replacement-battery-72v-3600mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}