Braun Series 7 720 Replacement Battery 3.7V 1600mAh
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Braun Series 7 720 Replacement Battery 3.7V 1600mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Braun Series 7 720 Replacement Battery 3.7V 1600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1600mAh
Braun Series 7 720 / 760 / 790 — 3.7V Li-ion Replacement Battery
This 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.
- Series 7 platform compatibility: 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.
- Bench tested on actual hardware: 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.
- Port drying before charging: 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.
Capacity fade from daily partial charging on the Series 7
Most 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.
Motor speed dropping before the indicator shows low
The 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.
Compatible Models
Technical Specifications
Product Highlights
- Brand: Braun
- Manufacturer: CS
- Series: Standard
- Color: Blue
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My Braun Series 7 shaver slows down halfway through a shave but the battery indicator still shows charge — what's happening?
The motor draws a higher current spike during thick passes, and an aged cell can't hold voltage under that load even if the resting voltage looks fine. The shaver's processor reads voltage under load and throttles the motor when it sags — the indicator only reflects resting voltage, so the two readings disagree. This is internal resistance rising as the cell degrades, not a firmware fault. Replacing the cell restores full motor speed; confirm the new cell holds above 3.4V under motor load during a shave.
After using the shaver in the shower, it won't charge — the dock light just blinks or nothing happens at all.
Water left in the charging port bridges the contacts and trips the BMS protection circuit. The shaver reads this as a dead battery rather than a charging fault, which makes the real cause hard to spot. Dry the port thoroughly — a few minutes with a lint-free cloth, then leave it open in a warm room for 20–30 minutes — before reconnecting to the dock. If the BMS tripped hard, disconnect from the dock for 60 seconds, dry again, then reconnect; this forces a BMS re-initialisation on most Series 7 units.
The dock contacts on my Series 7 look clean but the shaver still won't charge — could it be the contacts themselves?
Cleaning products and foaming shave gels leave a thin residue on the dock pins that doesn't look like oxidation but insulates the contact enough to break the charge circuit. Wipe both the dock pins and the shaver's charge contacts with a dry cotton swab, then a swab lightly dampened with isopropyl alcohol, and let them dry fully before docking again. This is a dock contact fault, not a battery fault — the battery itself isn't being reached by the charger at all in this scenario. If the charge indicator lights up normally after cleaning the contacts, the battery is fine.
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