{"product_id":"soundmaster-tr150ws-replacement-battery-37v-1200mah-li-ion","title":"Soundmaster TR150WS Replacement Battery 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSoundmaster TR150WS — 3.7V Li-ion 1200mAh Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion cell rated at 1200mAh (4.44Wh), built as a direct swap for the Soundmaster TR150WS. It matches the original cell's dimensions at 53.00 × 33.90 × 5.70mm, so it seats correctly in the battery bay without modification. Replace this when the original cell no longer holds a usable charge or the device powers off unexpectedly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTR150WS cell fit:\u003c\/strong\u003e\n    The TR150WS uses a single-cell 3.7V Li-ion configuration with a compact footprint. This replacement matches the connector orientation and physical envelope, so the BMS on the mainboard communicates with the cell as expected.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the bench. The BMS accepted the cell, held charge cutoff at 4.2V, and low-voltage cutoff engaged correctly before the cell reached damaging depth of discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, run one full discharge-to-charge cycle with fast charging disabled. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the TR150WS after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a different internal resistance profile than the aged cell the fuel gauge IC was calibrated against. Under load — screen on, network active — voltage can sag below the BMS cutoff threshold even when the gauge still reads 20–30%. The device interprets this as an emergency shutdown condition, not a flat battery. One full discharge and charge cycle without fast charging lets the coulomb counter re-anchor its endpoints to the new cell curve, which reduces premature cutoff events.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTR150WS not powering on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the replacement cell dropped below approximately 2.5V before installation, the BMS may have entered lockout mode to prevent cell damage. The device will show no response — no boot screen, no charge indicator. Connect the TR150WS to its charger and leave it for 15–20 minutes without pressing the power button; many BMS circuits include a trickle-recovery path that slowly raises cell voltage back above the 2.7V re-enable threshold before returning to normal charge behaviour.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405031506010,"sku":"BWCS-NK5CHL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405031538778,"sku":"BWCS-NK5CHL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405031571546,"sku":"BWCS-NK5CHL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK5CHL-1.webp?v=1779369842","url":"https:\/\/batteryweb.com\/products\/soundmaster-tr150ws-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}