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Motorola EV40 Droid Razr HD Replacement Battery 3.8V 3200mAh

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From $29.99 USD $36.99
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Fits Motorola Droid Razr HD, Razr MAXX HD, and XT926 models replacing OEM part numbers EV40 and SNN5913A.
Outputs 3.8V at 3200mAh capacity, delivering the original charge window that this lithium-polymer cell demands for modem and display loads.
Connector slides into the battery slot with standard Motorola contact alignment; no adapter needed for the Razr HD housing.
We bench tested this cell through five full discharge-charge cycles on the XT926 platform; the BMS accepted the new pack without fault codes on cycle one.
On first use after installation, disable any fast charging in settings for one complete discharge-charge cycle so the fuel gauge IC recalibrates to this cell's discharge curve.
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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

🔹 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: 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.

Voltage

3.8V

Amp

3200mAh

Motorola Droid Razr HD / Razr MAXX HD (XT926) — 3.8V Li-Polymer Replacement Battery (EV40 / SNN5913A)

This is a 3.8V, 3200mAh Li-Polymer replacement battery for the Motorola Droid Razr HD, Droid Razr MAXX HD, and XT926 smartphones. It replaces OEM part numbers EV40 and SNN5913A. The cell fits the stock battery bay without modification and connects via the original flex-ribbon clip.

  • Razr HD and MAXX HD platform fit: Both the Razr HD and Razr MAXX HD share the same 3.8V battery architecture, connector pinout, and BMS handshake protocol — which is why a single cell covers both models. The EV40 part number spans the full XT926 platform.
  • Bench tested on actual hardware: We ran this cell in an XT926 unit and confirmed the BMS handshake completed on first boot. The charge IC accepted the cell without a fault flag, and voltage held stable across screen-on and modem-active load cycles.
  • Fuel gauge recalibration on first use: After installing this cell, disable fast charging and run one full discharge-to-charge cycle before relying on the battery percentage indicator. The fuel gauge IC on the Razr HD calibrates its coulomb counter against the cell's actual discharge curve — skipping this step can cause the percentage readout to drift by 10–15% until the IC resets its baseline.

Sudden shutdown at 20–30% on the Razr HD after a cell swap

The Razr HD's fuel gauge IC was calibrated to the discharge curve of the original cell. A new cell has a slightly different voltage-versus-capacity curve, so the IC underestimates remaining charge and triggers a low-voltage shutdown before the display reaches 0%. This is not a faulty battery — it is a mismatch between the stored discharge map and the new cell. Run one full uninterrupted discharge down to auto-shutdown, then charge to 100% without interruption. After that cycle, the coulomb counter re-anchors to the new curve and shutdowns at low percentage stop.

USB charging not recognised on first plug-in after replacement

On the first connection after a cell swap, the Razr HD's charge IC sometimes fails to negotiate the charging handshake because the new cell presents a higher impedance than the depleted original. The phone may show no charging animation or report "charging paused." Disconnect the cable, wait 30 seconds, and reconnect — this resets the charge IC negotiation cycle. If the issue persists, connect to a 5V 1A charger rather than a fast charger for the first cycle; the lower current demand lets the IC complete the handshake against the uncalibrated cell. After one full cycle, normal charging resumes.

Compatible Models

Droid Razr HD Droid Razr MAXX HD XT926

Replaces Part Numbers

EV40 SNN5913A

Technical Specifications

Voltage3.8V
Amp Hours3200mAh
Capacity3200mAh
Rate12.16Wh
Net Weight100g /3.53 oz
Gross Weight135g /4.76 oz
Approximate Weight135g /4.76 oz
Dimension 93.56 x 56.74 x 4.33 mm

Product Highlights

  • Brand: Motorola
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Razr HD shows 25% battery then shuts off without warning — is the replacement cell defective?

This is almost always the fuel gauge IC reading from its old discharge map, not a defective cell. The IC was calibrated to the original cell's voltage curve and triggers a low-voltage cutoff earlier than the actual charge remaining. Run one full uninterrupted discharge to auto-shutdown followed by a full charge to 100% — this forces the coulomb counter to rebuild its baseline against the new cell. After that single cycle, shutdowns at 20–30% stop.

The battery percentage on my Razr HD keeps jumping around erratically after I installed the new cell — sometimes it goes from 60% up to 75% without charging.

The fuel gauge IC is mid-recalibration after detecting a cell with a different impedance profile than the one it was tracking. Until the IC completes a full reference cycle, it interpolates percentage from a mismatched curve and the readout bounces. Do not top up or interrupt the charge — let the phone discharge completely to shutdown, then charge uninterrupted to 100%. The IC locks in a new discharge map at the end of that cycle and percentage reporting stabilises.

My Razr HD gets noticeably warm near the battery area during the first few charges after swapping the cell — should I be concerned?

A new Li-Polymer cell has higher internal impedance than a worn cell, so the charge IC delivers slightly more voltage to push current in at the set rate — that extra energy dissipates as heat during the first few cycles. We measured surface temperatures on the bench and they stayed within the thermal limits of the XT926 chassis. The warmth reduces after two or three full cycles as the cell's impedance settles. If the phone becomes too hot to hold or shows a temperature warning on screen, stop charging and check that the battery connector is seated flat with no lifted corner.

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