{"product_id":"flex-fx1431a-replacement-battery-24v-3000mah-li-ion","title":"FLEX FX0121 24V 3000mAh Compatible Battery for FX1431A","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFLEX FX1431A \/ FX2141R Series — 24V Li-ion Replacement Battery (FX0121)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 24V Li-ion battery rated at 3000mAh (72Wh), replacing OEM part numbers FX0121, FX0311-1, FX0411, and FX0431. It fits FLEX cordless drills, impact drivers, and multi-tool platforms including the FX1431A, FX2141R, FX2141-Z, and FX2241-Z. Voltage and connector type match the original pack exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFX1431A and FX2141 platform compatibility:\u003c\/strong\u003e\n    These models share the same 24V battery rail, connector pinout, and BMS communication handshake. One pack works across the full range without adapter or modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through repeated high-torque trigger pulls on a FLEX drill platform. The BMS held steady through motor-start inrush spikes and did not trip into overcurrent protection under normal load cycling.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBreak-in procedure for new packs:\u003c\/strong\u003e\n    On first use, run the tool at half load for two cycles before applying maximum torque. This lets the BMS profile the motor's inrush current draw and calibrate overcurrent protection thresholds before you push the tool hard.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS cutoff on motor-start inrush surge in FLEX 24V tools\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen you pull the trigger on a drill or impact driver, current demand spikes sharply before the motor reaches running speed. If the BMS registers this inrush spike above its overcurrent threshold, it disconnects the pack instantly. A new or storage-depleted battery is more likely to trip here because cell impedance is higher before the pack has been cycled. Running two moderate-load cycles first brings impedance down and reduces the chance of nuisance cutoffs at full trigger.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharger shows blinking red on a new 24V pack after storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMost FLEX 24V chargers reject packs where cell voltage has dropped below the charger's acceptance threshold — typically around 2.5V per cell. A pack that has sat unused for several months can fall below this level even if it was stored partially charged. To recover it, look for a \"wake\" or \"trickle\" mode on your charger and hold the pack in that mode for five to ten minutes until the charger transitions to normal charge. If your charger has no trickle mode, check that resting voltage across the pack terminals reads at least 18V before attempting a standard charge cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416003641434,"sku":"BWCS-FEX214PW-1","price":68.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416003674202,"sku":"BWCS-FEX214PW-2","price":80.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416003706970,"sku":"BWCS-FEX214PW-3","price":88.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FEX214PW_1.webp?v=1779759245","url":"https:\/\/batteryweb.com\/products\/flex-fx1431a-replacement-battery-24v-3000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}