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

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

AEG Ventura TD9571 Cordless Phone Compatible Battery 2.4V 450mAh

Up to 20% off
New arrival
From $20.99 USD $25.99
Shipping calculated at checkout.
Fits AEG Ventura TD9571, Ventura TD9871, D9, D10, and compatible models as original 2.4V Ni-MH handset battery.
2.4V nominal with 450mAh capacity delivers full talk and standby time on DECT base station acceptance without voltage dropout during transmit.
Connector slides onto handset contacts with positive tab oriented forward; no locking required, seats flush against battery compartment walls.
Bench test showed BMS acceptance on first insertion into Ventura base station; voltage held steady under simulated RF load without cutoff.
After installing, place the handset in the base for a full 16-hour charge before first use — NiMH cordless batteries require slow first charge to reach rated capacity.
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
WECARE5
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

2.4V

Amp

450mAh

AEG Ventura TD9571 / TD9871 — 2.4V Ni-MH Replacement Battery

This is a 2.4V, 450mAh Ni-MH replacement battery for AEG cordless phones including the Ventura TD9571, Ventura TD9871, D9, and D10 series. It slots into the handset where the original pack sits and restores the handset to full working order. Dimensions are 41.97 × 18.26 × 8.89mm — measure your existing battery before ordering if you are unsure.

  • Ventura TD9571, TD9871, D9 and D10 compatibility: These AEG handsets share the same 2.4V dual-cell Ni-MH bay, connector orientation, and charge-acceptance voltage range. One pack covers all listed models without any modification.
  • Bench tested on actual hardware: We ran this pack through a full charge cycle on a Ventura TD9571 base station. The base accepted the battery immediately, charge current held steady, and the charge indicator cleared without error.
  • First-charge protocol for Ni-MH cordless packs: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped from storage are partially discharged — skipping the slow first charge will reduce rated capacity and the battery will never fully recover.

Talk time shorter than the original battery after replacement

New Ni-MH cells do not deliver full capacity on the first cycle. Capacity builds across three to five full charge-and-discharge cycles as the cell chemistry stabilises. If talk time is noticeably short after the first day, do not return the battery yet — run the handset to low, place it in the base for a full charge, and repeat. By cycle four or five, capacity should be at or close to the rated 450mAh.

Base station not recognising the new pack — charge light stays off or shows error

Ni-MH packs that have been in storage can drop to a resting voltage below the base station's charge-acceptance threshold. The base sees this as an invalid or absent battery and will not start the charge cycle. Remove the handset, leave it out of the base for 30 seconds, then reseat it firmly — the base will retry detection. If the light still does not respond, check that the handset contacts are clean and making full contact with the base pins; a brief wipe with a dry cloth on both contact sets usually resolves it.

Compatible Models

Ventura TD9571 Ventura TD9871 D9 D10 Ventura FS SMS

Technical Specifications

Voltage2.4V
Amp Hours450mAh
Capacity450mAh
Rate1.08Wh
Net Weight13.6g /0.48 oz
Gross Weight39g /1.38 oz
Approximate Weight39g /1.38 oz
Dimension 41.97 x 18.26 x 8.89mm

Product Highlights

  • Brand: AEG
  • 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 AEG Ventura TD9571 lost most of its range after I put in the new battery — is the battery faulty?

Range drops when transmit voltage sags under RF load, which happens when a Ni-MH pack is not yet fully conditioned. The handset radio draws a sharp current spike every time it transmits, and a partially charged or unconditioned cell cannot sustain voltage through that spike. Do the full 16-hour first charge, then complete three to five full cycles. Range should stabilise once the pack reaches its rated 450mAh.

The handset lost its pairing with the base after I swapped the battery — how do I fix it?

Some AEG DECT handsets drop their pairing registration when power is fully removed, because the pairing data is held in volatile memory. This is not a battery fault. Re-register the handset using the base station's registration mode — on most AEG units, hold the registration button on the base for three seconds until the base beeps, then follow the handset's on-screen pairing prompt.

The battery drains completely overnight even when the handset is sitting in the base — what is causing this?

Overnight drain in the base points to a seating issue, not a faulty cell. If the handset is even slightly off-centre, the charge contacts do not close the circuit and the handset runs entirely on battery in standby. Lift the handset out, reseat it with a firm downward press until you feel or hear it click into position, and check that the charge indicator light comes on within a few seconds.

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

AEG Ventura TD9571 Replacement Battery, 2.4V, 450mAh, Ni-MH 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