Corsair HS70 Replacement Battery AHB504258 3.7V 1400mAh
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Corsair HS70 Replacement Battery AHB504258 3.7V 1400mAh - 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.
Corsair HS70 Replacement Battery AHB504258 3.7V 1400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1400mAh
Corsair HS70 / HS75 XB / VOID Series — 3.7V Li-Polymer Replacement Battery (AHB504258)
This is a 3.7V, 1400mAh Li-Polymer replacement battery for the Corsair HS70, HS70SE, HS75 XB, and VOID wireless headset series. It replaces OEM part number AHB504258. Fit this battery when the original cell no longer holds enough charge to sustain a full session.
- HS70, HS70SE, HS75 XB, and VOID compatibility: These models share the same 3.7V cell format, connector type, and BMS handshake protocol. Swapping this battery across any of them keeps the charge reporting accurate inside Corsair iCUE.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the HS70 platform. The BMS accepted the pack without error, charge indicators responded correctly, and iCUE reported battery state as expected throughout.
- First-cycle base station charge: Seat the headset in its base station and let it complete one full uninterrupted charge before use. The base needs to complete a full charge handshake with the new cell before the talk-time estimate in iCUE reads accurately.
Why the HS70 cuts out mid-session even on a charged battery
The HS70 draws from two loads simultaneously — the DECT radio and the audio DSP. Under that combined draw, a degraded or freshly installed cell can sag below the BMS cutoff threshold before the reported percentage reaches zero. The headset drops audio or disconnects entirely, even though iCUE showed 20–30% remaining moments earlier. This is a voltage sag event, not a capacity fault. After the first three to five full cycles on a replacement cell, internal resistance drops and the sag narrows — the cutoff threshold sits around 3.0V on this platform.
Base station shows full charge but headset shuts off after a few minutes
A new Li-Polymer cell ships at storage voltage — roughly 3.6–3.8V — not at full charge. The base station can misread this as a complete charge and stop the charge cycle early. The headset then runs from a partially filled cell and cuts off quickly. Pull the headset from the base, power it on until it shuts down from low battery, then reseat it for a full uninterrupted charge. That forces the charger to re-evaluate the cell from a true low-state and fill it to the correct 4.2V endpoint.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Corsair
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-Polymer
- Battery Type: Li-Polymer
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My HS70 keeps cutting out mid-game even though the battery shows it still has charge left — what's happening?
This is voltage sag under combined DECT radio and audio DSP draw. When the cell is new or degraded, internal resistance causes the voltage to dip below the BMS cutoff before the percentage indicator reaches zero. It is not a faulty battery — it improves across three to five full discharge and recharge cycles as internal resistance stabilises. If it still cuts out after five cycles, check that the cell is seating flush and the connector is fully engaged.
The base station light goes green quickly after fitting the new battery, but the headset only lasts a short time before dying — is the charger broken?
The charger is not broken. A new Li-Polymer cell arrives at storage voltage, and some base stations misread that resting voltage as a near-full charge and end the cycle early. Power the headset on and run it down until it shuts off automatically, then reseat it in the base for a full uninterrupted charge. This forces the charger to start from a confirmed low state and charge the cell to its proper 4.2V endpoint.
The headset gets noticeably warm during long sessions — is that normal with this replacement cell?
Some warmth is expected. The HS70 housing is compact, and sustained combined draw from the wireless radio and audio processing generates heat in a small space. The cell and BMS are rated to handle this operating temperature. If the headset becomes hot to the touch rather than warm, check that the mesh grille and housing vents are not blocked, and avoid resting the headset face-down on a surface during long sessions.
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