Pax A920 MAX Replacement Battery 6.4V 2500mAh YW-026
This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.
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Pax A920 MAX Replacement Battery 6.4V 2500mAh YW-026 - 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.
Pax A920 MAX Replacement Battery 6.4V 2500mAh YW-026 - is backordered and will ship as soon as it is back in stock.
Voltage
6.4V
Amp
2500mAh
Pax A920 MAX — 6.4V Li-Polymer Replacement Battery (YW-026)
This is a 6.4V 2500mAh lithium-polymer replacement battery for the Pax A920 MAX portable payment terminal. It fits the A920 MAX directly, using OEM part number YW-026. Capacity is sourced from the product specification — 16Wh.
- A920 MAX platform fit: The A920 MAX runs a single battery bay with a specific connector and BMS handshake tied to the YW-026 cell profile. Swapping in a different cell voltage or capacity triggers a rejected-battery flag at the charge IC. This unit matches that profile exactly.
- Bench tested on actual hardware: We ran this cell through a full charge cycle on an A920 MAX unit. The BMS accepted the handshake on first boot, charge IC entered CC/CV mode normally, and the terminal completed its PCI boot sequence without a fault flag.
- First-deployment cycle on the A920 MAX: 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.
Receipt printer causing unexpected battery drain on the A920 MAX
The A920 MAX thermal printer draws a sharp current spike each time it feeds paper — this is separate from the display and wireless draw running simultaneously. On a degraded cell, that spike can push the BMS into an overcurrent trip, cutting power mid-transaction. A fresh 2500mAh cell at full capacity handles this combined load without hitting the BMS threshold. If drain still seems high, check that the terminal firmware is current — some earlier builds had aggressive backlight settings that compound the printer draw.
Terminal not completing PCI boot sequence after battery replacement
The A920 MAX runs a PCI-mandated hardware integrity check at every boot. If the battery voltage is below approximately 6.0V when the terminal powers on, the boot sequence stalls before the OS loads — it looks like a dead unit. Charge the replacement battery to full before the first boot attempt. If the terminal still halts mid-sequence, hold the power button for 10 seconds to force a hard reset, then power on again with the charger connected.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Pax
- 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 A920 MAX reboots every time a receipt prints — is this a battery fault or a terminal fault?
That reboot is a BMS overcurrent trip caused by the printer motor pulling a current spike on top of the display and wireless load running at the same time. A degraded or low-capacity cell can't supply that combined draw without the BMS cutting in. Fit a fresh YW-026 cell at full charge and repeat the transaction. If the reboot stops, the original cell had dropped below usable capacity.
The A920 MAX won't power on at all after sitting unused in a stockroom for several months — what's happening?
Lithium-polymer cells self-discharge at roughly 2–3% per month. After several months in storage, the cell may have dropped below the 3.0V-per-cell recovery threshold, and the BMS will block charge to prevent damage. Connect the terminal to the OEM charger and leave it for at least 90 minutes without pressing the power button — some charge ICs enter a trickle-recovery mode before resuming full charge. If the terminal still shows no activity after two hours on charge, the original cell is unrecoverable and needs replacing.
The charge indicator on my A920 MAX has been stuck at 99% since I installed the new battery — is something wrong?
Nothing is wrong. When a new cell first enters the charge IC, the controller holds in top-off mode — it applies a small trickle current to bring the cell to its exact full-charge voltage before updating the display register. That process typically takes 20 to 40 minutes after the bar reaches 99%. Once the charge IC releases top-off mode, the indicator will step to 100% and the terminal will log the full capacity baseline for future state-of-charge calculations.
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