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Motorola EU20 DROID ULTRA Replacement Battery 3.8V 2100mAh

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New arrival
From $24.99 USD $30.99
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Fits Motorola DROID ULTRA, XT1080, XT1080M using EU20 or SNN5924A OEM battery slots.
3.8V at 2100mAh delivers the same charge capacity as the original cell for full-day standby use.
Connector seats flush into the battery door slot with no locking tab; insertion is straight vertical only.
We bench-tested this pack on XT1080 hardware — the fuel gauge IC accepted the new cell voltage curve without lockout.
On first charge after installation, complete one full discharge-to-shutdown cycle before resuming normal use to recalibrate the phone's coulomb counter against the new cell's discharge profile.
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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

2100mAh

Motorola DROID ULTRA / XT1080 — 3.8V Li-Polymer Replacement Battery (EU20 / SNN5924A)

This is a 3.8V, 2100mAh lithium-polymer replacement battery for the Motorola DROID ULTRA, XT1080, XT1080M, and DROID MAXX smartphones. It slots into the original battery bay using the same form factor as the OEM cell. Capacity is 2100mAh (7.98Wh) — identical to the factory specification.

  • XT1080 and DROID MAXX platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The EU20 and SNN5924A part numbers cover the full XT1080 variant stack, including the XT1080M carrier build.
  • Bench tested on actual hardware: We cycled this cell through a full discharge-charge sequence on an XT1080 unit. The BMS accepted the cell without a protection trip, and the charge IC negotiated correctly at the standard 3.8V nominal rail.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Sudden shutdown at 20–30% on the DROID ULTRA after a cell swap

This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The reported percentage does not match the new cell's actual voltage under load. When the modem fires a high-draw burst or the screen brightness peaks, the cell voltage drops below the BMS cutoff threshold even though the OS shows charge remaining. One full discharge-charge cycle forces the coulomb counter to reset against the new cell's actual capacity.

OS reporting wrong battery percentage after replacement

The XT1080 stores learned capacity data in the fuel gauge IC — that data references the old, degraded cell. After swapping in a fresh 2100mAh cell, the IC uses stale calibration, so the percentage readout drifts or jumps erratically. Drain the battery fully until the phone shuts off, then charge to 100% without interruption. After one complete cycle the coulomb counter recalibrates and the percentage stabilises.

Compatible Models

DROID ULTRA XT1080 XT1080M DROID MAXX DROID MAXX 4G LTE DROID ULTRA 4G LTE Droid Ultra XT1080

Replaces Part Numbers

EU20 SNN5924A

Technical Specifications

Voltage3.8V
Amp Hours2100mAh
Capacity2100mAh
Rate7.98Wh
Net Weight36.5g /1.29 oz
Gross Weight72g /2.54 oz
Approximate Weight72g /2.54 oz
Dimension 104.48 x 60.50 x 2.55mm

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

My DROID ULTRA won't power on at all after the replacement battery sat in a drawer for months — is the cell dead?

The BMS locks out the cell when voltage drops below roughly 2.5V per cell during extended storage — this is a protection cutoff, not a failed cell. Plug the phone into a wall charger and leave it for 20–30 minutes before attempting to power on; the charge IC trickle-charges the cell back above the BMS recovery threshold. If the charging LED does not appear within 5 minutes, try a different cable and adapter to rule out a current delivery issue. Once voltage recovers above 3.0V the BMS releases the lockout and the phone boots normally.

The DROID ULTRA feels warm near the battery during the first few charges after swapping this cell — is that normal?

A new high-impedance lithium-polymer cell generates slightly more heat than a worn cell during initial charge cycles because the charge IC has not yet mapped the cell's internal resistance. This is expected on the first two to three charge cycles and settles as the cell conditions. If the phone becomes hot to the touch — not just warm — or the charging LED cuts out early, check that the battery connector is fully seated and the gold contacts are clean. The warmth should reduce noticeably by the third full charge cycle.

Fast charging stopped working on my XT1080 after I installed this battery — the phone only charges slowly now.

The XT1080's charge IC re-evaluates the BMS on the first cycle after a cell swap and can default to a conservative trickle rate until it confirms the cell is stable. Run one complete discharge down to automatic shutdown, then plug in and charge fully without disconnecting — this completes the handshake and the fast charge rate should resume on the next session. If slow charging persists after that cycle, check the charger output; the XT1080 requires a charger rated at 1.5A or higher to engage its higher charge current profile.

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