{"product_id":"panasonic-ez502-replacement-battery-24v-1500mah-ni-mh","title":"Panasonic EZ902 2.4V Ni-MH Replacement Battery 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePanasonic EZ502 \/ EZ503 Series — 2.4V Ni-MH Replacement Battery (EZ902)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 2.4V, 1500mAh Ni-MH replacement battery for the Panasonic EZ502 and EZ503 compact drill\/drivers, along with the EZ581, EY3652, and over 20 additional models in this series. It replaces OEM part numbers EZ902, EY9021, EY9021B, EY903, EY903B, and several others. Physical dimensions are 100.19 x 39.38 x 38.38mm — check your original pack before ordering if space is tight.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEZ502 \/ EZ503 platform fit:\u003c\/strong\u003e\n    These models share the same 2.4V single-cell architecture, connector pinout, and pack housing — one battery SKU covers the range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on the EZ502 platform through repeated trigger pulls and monitored cell voltage recovery between draws. The Ni-MH chemistry held voltage flat through moderate load without the BMS tripping on inrush.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle load conditioning:\u003c\/strong\u003e\n    Run the drill at half torque for two full discharge-charge cycles before driving at maximum torque. This lets the internal cell resistance stabilise so the tool's overload protection doesn't trip early on hard fasteners.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EZ502 cuts out instantly on trigger pull\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe EZ502 motor draws a sharp inrush current the moment the trigger engages — this spike is 3 to 5 times the steady running current. On a degraded or deeply discharged Ni-MH pack, internal resistance is high enough that the voltage rail collapses under that spike. The tool's protection circuit reads it as a fault and kills output before the motor even spins. A fresh, properly conditioned pack with low internal resistance handles the inrush without dropping below the cutoff threshold.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharger not recognising a new pack after storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH packs stored for extended periods can self-discharge below the charger's acceptance voltage — the charger sees the low voltage and refuses to begin a charge cycle. This is not a dead pack. Place the battery in the charger and check for a blinking or error light; if the charger won't initiate, try a brief trickle from a compatible 2.4V source to raise the cell voltage above 2.0V. Once the pack crosses the charger's threshold — typically around 2.0–2.1V per cell — the standard charge cycle will engage normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416074944602,"sku":"BWCS-PEZ502PW-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416074977370,"sku":"BWCS-PEZ502PW-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416075010138,"sku":"BWCS-PEZ502PW-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PEZ502PW-1.webp?v=1779760143","url":"https:\/\/batteryweb.com\/products\/panasonic-ez502-replacement-battery-24v-1500mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}