Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Aisino V71 POS Terminal Replacement Battery IS803 3.7V

Up to 20% off
New arrival
From $31.99 USD $39.99
Shipping calculated at checkout.
Fits Aisino V71 payment terminal, part number IS803 direct replacement.
3.7V 3400mAh lithium-ion cell delivers full transaction cycles without mid-sale cutoff.
Single-cell connector seats flat into the terminal battery slot with retention clip.
Bench test showed clean BMS response on first charge cycle, no fault codes.
After installation, run one complete transaction cycle before live deployment — terminal calibrates charge indicator during normal operation and requires full power cycle to map capacity correctly.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

3.7V

Amp

3400mAh

Aisino V71 — 3.7V Li-ion Replacement Battery (IS803)

This is a 3.7V 3400mAh Li-ion battery for the Aisino V71 mobile payment terminal. It replaces OEM part IS803 directly. The V71 is a handheld POS device used by merchants for card transactions, receipt printing, and wireless connectivity — all drawing from this single cell.

  • V71 platform fit: The V71 uses a dedicated battery bay with a connector keyed to the IS803 form factor. The BMS in the terminal negotiates with the cell over a dedicated sense line — voltage rail must sit at 3.7V nominal for the handshake to clear on boot.
  • Bench tested on actual hardware: We cycled this cell through combined display, wireless, and printer draw. The BMS held stable through print-motor current spikes without tripping overcurrent protection. Capacity measured within spec at 3400mAh across discharge cycles.
  • First-deploy calibration: After fitting this battery, run one complete transaction — card read through receipt print — before deploying in a live environment. The V71 maps cell capacity during normal operation and needs at least one full power cycle to calibrate the charge indicator correctly.

Receipt printer causing BMS trip mid-transaction on the V71

The V71's integrated receipt printer pulls a short high-current spike when the motor engages. On a degraded original battery, internal resistance has risen enough that this spike drops cell voltage below the BMS cutoff threshold — the terminal shuts off mid-sale. A fresh IS803 cell has lower internal resistance, so the voltage stays above that threshold during the motor-start draw. If reboots persist after fitting this battery, check that the terminal firmware is current, as older builds have a tighter BMS overcurrent threshold.

V71 stuck showing 99% charge after fitting a new battery

This is the charge IC entering top-off mode on a new cell. The terminal's charge controller applies a reduced current once it detects a full cell, and the display rounds to 99% while top-off completes. It is not a fault with the battery or the terminal. Leave the terminal on charge for a further 20–30 minutes until the indicator steps to 100% and the charge LED changes state.

Compatible Models

V71

Replaces Part Numbers

IS803

Technical Specifications

Voltage3.7V
Amp Hours3400mAh
Capacity3400mAh
Rate12.58Wh
Net Weight50.5g /1.78 oz
Gross Weight75.5g /2.66 oz
Approximate Weight75.5g /2.66 oz
Dimension 66.00 x 22.10 x 18.72mm

Product Highlights

  • Brand: Aisino
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Aisino V71 reboots every time I print a receipt — will a new battery fix this?

Most likely yes. The receipt printer motor draws a sharp current spike on startup. If the existing battery's internal resistance has increased with age, that spike pulls cell voltage below the BMS cutoff and the terminal shuts off. A fresh IS803 cell handles the motor-start draw without the voltage drop that triggers the reboot. Fit the new battery, run a test transaction with a receipt, and confirm the terminal stays on through the print cycle.

My V71 won't power on at all after sitting in a drawer for a few months — is the battery dead?

Extended storage without charge can drop the cell below the recovery threshold the terminal's BMS will accept. This is a self-discharge issue, not a faulty battery. Connect the terminal to its charger and leave it for at least 90 minutes before attempting to power on — the charge IC needs time to trickle-charge the cell back above the minimum voltage before the BMS will allow a boot sequence to start. If the terminal still won't start after 90 minutes on charge, check the charger output is sitting at the correct voltage with a multimeter.

The V71 charge indicator is jumping around between 40% and 80% during busy transaction periods — what's causing it?

This is voltage sag under combined load. During a heavy transaction period the terminal runs the display, wireless radio, and printer simultaneously, which pulls the cell voltage down and causes the charge IC to read a falsely low state of charge. A degraded original battery with high internal resistance makes this worse. Fitting a fresh IS803 cell reduces internal resistance and tightens the voltage under combined draw — the charge indicator should stabilise once the new cell has completed one full charge-discharge cycle.

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.

Related Products

Aisino V71 Replacement Battery, 3.7V, 3400mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections