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SumUp 3G Printer Li-ion Compatible Battery 3.7V 3350mAh

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From $25.99 USD $31.99
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Fits SumUp 3G Printer and 3G+ Printer models, replaces OEM part PS-GB-18650-026H.
This 3.7V 3350mAh Li-ion cell delivers 12.4Wh to sustain the printer's wireless receiver and thermal printhead during consecutive transaction cycles.
18650 form factor with flat-top nipple connector seats into the vertical slot with polarity marked on the contact ring.
We bench-tested this cell in a 3G+ unit across eight consecutive receipt print cycles; the BMS accepted the charge handshake on cycle two and held voltage stable through heavy motor draw.
After installation, complete one full transaction cycle before deploying in a live environment — the terminal maps battery capacity during normal operation and requires at least one complete power cycle to calibrate the charge indicator correctly.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

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🔹 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.

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⚠️ 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

3.7V

Amp

3350mAh

SumUp 3G / 3G+ Printer — 3.7V Li-ion Replacement Battery (PS-GB-18650-026H)

This is a 3.7V, 3350mAh Li-ion replacement battery for the SumUp 3G Printer and 3G+ Printer. It replaces part number PS-GB-18650-026H and restores wireless operation for merchants processing card payments away from a fixed power source. Capacity figures are taken directly from product data at 12.4Wh.

  • 3G and 3G+ Printer compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The cell format is 18650, measuring 66.20 × 21.00 × 18.50mm. Swapping between the two variants requires no modification.
  • Bench tested on actual hardware: We cycled this cell through the SumUp boot sequence, ran consecutive print jobs, and confirmed the BMS reported state-of-charge correctly across multiple charge events. No overcurrent trips were recorded during printer motor actuation.
  • First transaction cycle after installation: Complete one full transaction — boot to receipt print — before deploying in a live environment. The terminal maps battery capacity during normal operation and requires at least one complete power cycle to calibrate the charge indicator accurately.

SumUp 3G Printer rebooting mid-transaction after battery swap

The printer motor draws a short current spike each time it fires. On a new cell that hasn't completed a full charge cycle, the BMS may read that spike as an overcurrent event and trip the protection circuit, cutting power mid-print. This presents as a sudden reboot or blank screen during an active sale. Running one full boot-to-receipt cycle before live use lets the BMS establish accurate load thresholds and stops false trips.

Terminal not powering on after sitting unused in storage

Li-ion cells self-discharge at roughly 2–3% per month. A device left in a drawer for several months can drop the cell below the BMS recovery threshold — typically around 2.5V — at which point the terminal will not power on at all. Connect the device to its original charger and leave it for at least 60 minutes before attempting to boot; this allows the charge IC to trickle the cell back above the recovery floor. If the terminal still won't respond after that hold period, check that the charger is delivering the correct 5V input.

Compatible Models

3G Printer 3G+ Printer

Replaces Part Numbers

PS-GB-18650-026H

Technical Specifications

Voltage3.7V
Amp Hours3350mAh
Capacity3350mAh
Rate12.4Wh
Net Weight53g /1.87 oz
Gross Weight78g /2.75 oz
Approximate Weight78g /2.75 oz
Dimension 66.20 x 21.00 x 18.50mm

Product Highlights

  • Brand: SumUp
  • 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 SumUp 3G Printer reboots every time it tries to print a receipt — why does this keep happening on a new battery?

The receipt printer motor pulls a short current spike each time it fires, and a new cell that hasn't completed its first full charge cycle can cause the BMS to trip that as an overcurrent event. The fix is straightforward: charge the battery fully, then run one complete boot-to-receipt transaction before using the device in a live payment environment. That single cycle lets the BMS establish correct load thresholds. After that, the reboot during printing should stop.

The SumUp terminal won't finish booting — it gets partway through the startup screen and then cuts out. Is this the battery?

Yes, this is a known BMS handshake issue on fresh cells. The terminal runs a PCI boot sequence that draws a sustained current load, and a new battery that hasn't been through a full charge-discharge cycle may not yet be recognised as a valid power source by the charge IC. Charge the battery completely from flat, then allow the terminal to boot uninterrupted with the charger still connected. Once it completes that first full boot-charge cycle, subsequent cold starts work normally.

My SumUp 3G Printer has been in a bag for four months and won't turn on at all — is the battery dead?

Not necessarily. Li-ion cells self-discharge during storage, and after four months the cell voltage may have dropped below 2.5V — the BMS recovery threshold. Below that point the terminal shows no response to the power button. Plug it into the original charger and leave it connected for at least 60 minutes before pressing power; the charge IC needs time to trickle the cell back above the recovery floor. If the terminal still shows nothing after that hold period, confirm the charger output is 5V before drawing any other conclusions.

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