{"product_id":"retekess-hr-11s-replacement-battery-37v-1200mah-li-ion","title":"Retekess HR-11s Replacement Battery 3.7V 1200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRetekess HR-11s \/ V115 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1200mAh Li-ion cell replaces the original battery in the Retekess HR-11s and V115 wireless tour guide receivers. These are compact audio receiver units — not smartphones — used in guided tours and group presentations. The cell matches the original voltage and capacity at 4.44Wh, and fits within the 53.00 × 33.90 × 5.70mm envelope of the battery bay.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHR-11s and V115 platform fit:\u003c\/strong\u003e\n    Both units run on the same 3.7V single-cell architecture with the same physical footprint, so they share this battery. The BMS protection circuit handles over-discharge cutoff and charge termination the same way across both models.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge passes on the HR-11s receiver. The BMS protection tripped correctly at the low-voltage threshold, and charge termination occurred cleanly at 4.2V without thermal runaway.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use recalibration on the HR-11s:\u003c\/strong\u003e\n    After fitting a new cell, run one complete discharge to low-battery shutoff, then charge fully without interruption. The receiver's fuel gauge IC was calibrated to the old cell's discharge curve — this single cycle resets it against the new cell so the indicator reads accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the HR-11s battery indicator reads full but shuts off early\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe HR-11s uses a simple fuel gauge IC that maps voltage to a percentage based on the discharge curve of the original cell. A new cell has a slightly different curve, so the gauge reads higher than the actual state of charge. The device then hits the BMS low-voltage cutoff before the indicator reaches zero. One full discharge-charge cycle after installation re-anchors the IC to the new cell's actual curve and eliminates premature shutoffs.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery not charging after the receiver sat unused in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the HR-11s sat discharged for weeks or months, the cell may have dropped below 2.5V — the BMS protection floor. At that level the BMS locks out normal charge current to protect the cell. Plug the receiver into a USB charger and leave it connected for 20–30 minutes without powering it on; the charger trickle-feeds current through the protection circuit at a safe rate. If the charge LED does not respond after 45 minutes, measure cell voltage directly — anything below 2.0V indicates an unrecoverable cell and the battery needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404142379098,"sku":"BWCS-AVC120SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404142411866,"sku":"BWCS-AVC120SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404142444634,"sku":"BWCS-AVC120SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AVC120SL-1.webp?v=1779369080","url":"https:\/\/batteryweb.com\/products\/retekess-hr-11s-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}