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Resistacap Inc N250AAAF3WL Compatible Battery 3.6V 700mAh

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From $23.99 USD $29.99
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Fits Resistacap Inc N250AAAF3WL payment terminals, replaces Resistacap Inc CUSTOM-122 battery pack.
3.6V, 700mAh Ni-MH cell powers transaction processing on portable POS devices without interruption.
Connector type matches original battery slot; orientation keyed by contact alignment on terminal housing.
Bench testing confirmed stable voltage delivery under receipt printer motor load and wireless transmission draw.
After installation, run one complete transaction cycle before live deployment — terminal calibrates battery capacity indicator during normal operation.
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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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⚠️ 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

3.6V

Amp

700mAh

Resistacap Inc N250AAAF3WL — 3.6V Ni-MH Replacement Battery (CUSTOM-122)

This is a 3.6V, 700mAh Ni-MH replacement battery for the Resistacap Inc N250AAAF3WL payment terminal. It fits the N250AAAF3WL directly and restores battery-backed operation to the terminal. Voltage and connector match the original cell specification.

  • N250AAAF3WL platform fit: The N250AAAF3WL uses a 3.6V Ni-MH cell with a specific connector orientation and BMS handshake tied to that voltage rail. Swapping in a cell outside that spec causes the terminal to reject the battery or loop at the boot screen. This cell matches the voltage rail and connector the terminal expects.
  • Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a payment terminal test rig. The BMS accepted the handshake on first boot, charge acceptance was normal, and the terminal completed its PCI boot sequence without interruption.
  • First transaction cycle after installation: Complete one full transaction cycle before deploying this terminal in a live environment. The N250AAAF3WL maps battery capacity during normal operation and needs at least one complete power cycle to calibrate the charge indicator accurately.

Terminal not completing PCI boot sequence after battery swap

The N250AAAF3WL runs a PCI security check during boot that includes a battery status read. If the BMS on the new cell hasn't completed its first handshake, the terminal can stall or loop at this screen. This isn't a fault with the cell — it's the terminal waiting for the BMS to confirm a valid charge state. Allow the terminal to complete one full charge cycle after installation. Once the cell reaches a stable charge, the boot sequence completes normally.

Battery indicator stuck at 99% after first charge

On a fresh Ni-MH cell, the charge IC in the N250AAAF3WL enters top-off mode near full capacity and holds the display at 99% for an extended period. This is normal charge controller behaviour — it's applying a trickle current to top the cell off before declaring 100%. No intervention is needed. Once the top-off phase completes, the indicator will move and stabilise at full charge.

Compatible Models

N250AAAF3WL

Replaces Part Numbers

CUSTOM-122

Technical Specifications

Voltage3.6V
Amp Hours700mAh
Capacity700mAh
Rate2.52Wh
Net Weight36.1g /1.27 oz
Gross Weight61g /2.15 oz
Approximate Weight61g /2.15 oz
Dimension 44.55 x 31.05 x 10.50mm

Product Highlights

  • Brand: Resistacap Inc
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My N250AAAF3WL reboots right when the receipt starts printing — is that the new battery?

Yes, that's a BMS overcurrent trip. The receipt printer motor draws a sharp current spike at the start of each print job, and on a new cell the BMS can trip if it hasn't yet calibrated to the terminal's load profile. Run three to five complete transaction-and-print cycles to let the BMS learn the draw pattern. After that, the trip threshold adjusts and mid-print reboots stop.

The terminal was sitting unused in a drawer for months and now won't power on at all — what happened?

A Ni-MH cell left discharged for an extended period can drop below the BMS recovery threshold — typically below 3.0V — and the terminal refuses to boot from a cell it reads as dead. Connect the terminal to its dock charger and leave it on charge for a full four-hour cycle without attempting to power it on. Most cells recover once the charge IC pushes voltage above the 3.2V recovery floor.

The terminal feels noticeably warm during a busy transaction period — is that a battery problem?

Warmth during heavy use is a load issue, not a cell fault. The N250AAAF3WL draws simultaneously from the display, wireless radio, and printer during a busy period, and that combined load generates heat across the battery and processor. Check that the terminal's ventilation slots aren't blocked and that it's not sitting flat on a surface that traps heat underneath. If the terminal throttles or shuts down, check that the charging dock is maintaining the cell above 3.4V between transactions.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

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