{"product_id":"braun-720-replacement-battery-37v-1600mah-li-ion","title":"Braun Series 7 720 Replacement Battery 3.7V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBraun Series 7 720 \/ 760 \/ 790 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1600mAh (5.92Wh) lithium-ion battery fits the Braun Series 7 720, 760, 790, 760CC, and related models. It replaces the original cell when the shaver no longer holds enough charge for cordless use. Swapping the battery extends the life of the shaver without replacing the entire unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSeries 7 platform compatibility:\u003c\/strong\u003e\n    These models share the same internal cell format, voltage rail, and BMS handshake. The 720, 760, 790, and 760CC all draw from the same 3.7V circuit, so one cell type covers the full group.\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 a Series 7 chassis. The BMS accepted the cell without error codes, completed a full charge cycle, and reported battery status correctly through the indicator LEDs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePort drying before charging:\u003c\/strong\u003e\n    For waterproof models used in the shower, dry the charging port completely before connecting the cable or dock. Moisture bridging the charging contacts triggers a BMS protection fault — the shaver reports a dead battery, not a charging error, so the actual cause is easy to miss.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCapacity fade from daily partial charging on the Series 7\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMost Series 7 users charge the shaver after every use, often before the battery drops below 50%. Lithium-ion cells in small shavers degrade faster under constant shallow cycling than under full discharge-recharge cycles. Over several months, the cell's actual capacity shrinks while the indicator still shows a normal charge level. When real-world capacity drops far enough, the shaver cuts out mid-use even though the indicator hasn't reached empty — that's when the cell needs replacing, not the shaver.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMotor speed dropping before the indicator shows low\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Series 7 motor draws a higher current spike on start-up and during thick beard passes. As the battery ages, internal resistance rises and the cell voltage sags under that load — even if the resting voltage reads fine. The shaver's processor reads voltage under load, not at rest, so it interprets the sag as a low-battery condition and reduces motor speed to protect the circuit. If the shaver slows noticeably under load but the indicator still shows two or three bars, measure the cell voltage under discharge: a healthy 3.7V cell should hold above 3.4V under the motor load of this shaver.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416129896538,"sku":"BWCS-PHN894SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416129929306,"sku":"BWCS-PHN894SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416129962074,"sku":"BWCS-PHN894SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PHN894SL-1.webp?v=1779760424","url":"https:\/\/batteryweb.com\/products\/braun-720-replacement-battery-37v-1600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}