{"product_id":"soundmaster-tr150ws-replacement-battery-37v-1000mah-li-ion","title":"Soundmaster TR150WS Replacement Battery 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSoundmaster TR150WS — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion cell built to replace the original battery in the Soundmaster TR150WS. The TR150WS is a compact portable radio with a built-in rechargeable cell — when that cell degrades, the device loses charge retention fast. This replacement matches the original voltage rail and physical footprint at 53.00 × 33.90 × 5.70mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTR150WS fit confirmation:\u003c\/strong\u003e\n    The TR150WS uses a single-cell 3.7V Li-ion pack on a straightforward charge circuit. This cell matches the voltage rail and connector orientation — no adapter or modification needed.\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 TR150WS charge circuit and confirmed the BMS accepted charge without triggering overcurrent cutoff. Cell voltage at full charge landed at 4.19V — within spec.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle recalibration on the TR150WS:\u003c\/strong\u003e\n    On first use after installation, disable fast charging if the device supports it and run one full discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before it reports accurate percentages.\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 cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still running the discharge curve it learned from the old, degraded cell. The new cell has a steeper voltage drop near the end of discharge, and the gauge misreads remaining capacity. When the device hits a load spike — speaker output or a tuner scan — the cell voltage sags below the shutdown threshold before the gauge catches it. Run two full discharge-charge cycles and the IC will remap to the new cell's actual curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTR150WS showing incorrect battery percentage after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores a learned capacity model tied to the old cell. A fresh cell with higher impedance than the aged original will confuse the coulomb counter, causing percentage jumps or a reading that stalls at one number for extended use. This is not a fault with the replacement cell — it is the IC recalibrating. Charge fully to 4.2V, run down to auto-shutoff, then charge fully again to reset the learned curve.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409496670298,"sku":"BWCS-NK5CMX-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409496703066,"sku":"BWCS-NK5CMX-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409496735834,"sku":"BWCS-NK5CMX-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK5CMX-1.webp?v=1779579814","url":"https:\/\/batteryweb.com\/products\/soundmaster-tr150ws-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}