{"product_id":"shark-550r-replacement-battery-37v-190mah-li-polymer","title":"Shark 550R Replacement Battery 3.7V 190mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eShark 550R — 3.7V Li-Polymer Replacement Battery (PL552025)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 190mAh Li-Polymer battery replaces the OEM cell in the Shark 550R flashlight. It fits the 550R's compact battery bay and reconnects directly to the LED driver board. Capacity matches the original PL552025 specification at 0.7Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e550R platform fit:\u003c\/strong\u003e\n    The 550R uses a single-cell Li-Polymer pack with a fixed 3.7V nominal rail feeding the LED driver. The PL552025 footprint — 26.50 × 20.34 × 5.00mm — is what locks this cell to that chassis. Any deviation in thickness or length will prevent the housing from closing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the bench and confirmed the BMS protection circuit trips correctly at the low-voltage cutoff threshold, preventing cell damage under full LED draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eDriver load tip for the 550R:\u003c\/strong\u003e\n    The 550R's LED driver pulls current in short high-intensity bursts. Avoid leaving the flashlight switched on in a bag or case unintentionally — parasitic drain at the driver level will pull the cell below its recovery threshold faster than standby self-discharge alone.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eShark 550R dimming before the battery indicator drops\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 550R's LED driver includes brownout protection that steps output down before the battery indicator registers low. This happens because the driver monitors voltage at the board, not at the cell terminal. At roughly 3.4V cell voltage, the driver reduces current to the LED rather than risk an uncontrolled cutoff. If the light dims noticeably but the indicator still shows charge, the cell is approaching its lower usable voltage — recharge now rather than continuing to draw.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003e550R light cycling through modes on its own near end of charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSpontaneous mode-cycling near the end of a charge cycle is a driver response to voltage instability, not a firmware fault. As the cell sags under load, the driver briefly loses the voltage headroom it needs to hold a stable mode, resets, and re-initialises — which reads to the user as mode switching. Switch to the lowest output mode to stop the cycling. Recharge the cell; full charge restores the voltage rail to the stable operating range above 3.7V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377508188250,"sku":"BWCS-SRK550FT-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377508221018,"sku":"BWCS-SRK550FT-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377508253786,"sku":"BWCS-SRK550FT-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SRK550FT-1.webp?v=1778767223","url":"https:\/\/batteryweb.com\/products\/shark-550r-replacement-battery-37v-190mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}