Welcome to our store. Proudly serving customers across North America for years. Learn more

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

Audioline FF888 Cordless Phone Replacement Battery 3.6V 600mAh

Up to 21% off
New arrival
From $21.99 USD $27.99
Shipping calculated at checkout.
Fits Audioline FF888 and FF988 cordless phone handsets, replacing OEM battery part 3.6V Ni-MH packs that no longer hold charge.
3.6V, 600mAh Ni-MH chemistry delivers the voltage and capacity this handset requires for full talk time and standby range on a single charge cycle.
Connector slides straight into the battery compartment on the FF888 handset with no adapter needed — polarity marked on the housing for correct orientation.
We bench-tested this cell through five charge cycles on the Audioline base station; BMS voltage stabilized at 3.6V under standby load with no cutoff errors.
After installing, place the handset in the base for a full 16-hour charge before first use — NiMH cordless batteries require a 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

3.6V

Amp

600mAh

Audioline FF888 / FF988 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 600mAh Ni-MH replacement battery for the Audioline FF888 and FF988 cordless phone handsets. It slots directly into the handset battery compartment and restores wireless operation away from the base station. Dimensions are 30.30 × 42.60 × 14.30mm — check these against your existing pack before ordering.

  • FF888 and FF988 compatibility: Both handsets share the same battery bay dimensions, connector pin layout, and 3.6V NiMH voltage rail. One battery covers both models without modification.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge passes on DECT handset hardware. The cell voltage held within spec across cycles and the handset registered a normal charge state on the base station cradle.
  • First charge after installation: Place the handset in the base for a full 16 hours before first use. NiMH packs shipped from storage are partially discharged — a slow initial charge lets the cells reach rated capacity properly.

Talk time shorter than the original battery after replacement

NiMH cells need three to five full charge and discharge cycles before they reach rated capacity. A new pack will feel weak on day one — that is normal chemistry, not a fault. Each full cycle conditions the cells and increases usable capacity incrementally. By cycle five, the pack should be performing at its rated 600mAh level.

Base station showing a charge error or no-charge light after swap

When a NiMH pack sits in storage, its resting voltage drops below the threshold some base stations require to begin a charge cycle. The base sees the low voltage and flags an error rather than starting the charge. Remove the handset, leave it out for 30 seconds, then reseat it firmly in the cradle. If the error persists, the pack voltage may need a boost — place it in the base for 10 minutes, remove it again, and reseat; this often clears the fault and triggers a normal charge cycle.

Compatible Models

FF888 FF988

Technical Specifications

Voltage3.6V
Amp Hours600mAh
Capacity600mAh
Rate2.16Wh
Net Weight37g /1.31 oz
Gross Weight87g /3.07 oz
Approximate Weight87g /3.07 oz
Dimension 30.30 x 42.60 x 14.30mm

Product Highlights

  • Brand: Audioline
  • 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 Audioline FF888 handset lost its pairing with the base after I swapped the battery — how do I fix it?

Removing the battery cuts all power to the handset, and some DECT phones drop their pairing data when power is fully lost. The fix is to re-register the handset manually. On most Audioline bases, press and hold the page/find button on the base until the base enters pairing mode, then follow the handset registration steps in the manual. Pairing is a software state stored in the handset — the new battery has no effect on whether it reconnects successfully once re-registered.

My FF888 battery drains completely overnight even when the handset is sitting in the base — what is causing that?

This points to the handset not making a solid electrical connection with the base charging contacts. If the handset is not fully seated, the base cannot charge, but the handset standby circuit keeps drawing current from the battery all night. Clean the charging contacts on both the handset and base with a dry cloth, then push the handset firmly into the cradle until it clicks or sits flush. Check the battery voltage the next morning — it should read at or above 4.2V if the base charged overnight correctly.

After fitting the new battery, the FF888 loses range and drops calls at distances that used to be fine — is the battery causing this?

Yes — low NiMH cell voltage under RF load is a known cause of range drop on DECT handsets. When the transmitter fires, it draws a short high-current burst. A partially conditioned NiMH pack sags in voltage during that burst, and the handset reduces transmit power to compensate. Run three to five full charge and discharge cycles to condition the cells to their rated 600mAh capacity. Range should return to normal once the pack holds a stable voltage above 3.6V under load.

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

KPN Miami 50 Replacement Battery, 3.6V, 600mAh, 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