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

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

Indexa OS360A Replacement Battery 4.8V 2000mAh Ni-CD

Up to 20% off
New arrival
From $39.99 USD $49.99
Shipping calculated at checkout.
Fits Indexa OS360A, OS365A, 151A, and 32094 alarm panels; replaces AKKU-360A and BAT4V8 battery packs.
4.8V, 2000mAh Ni-CD cell delivers backup power to wireless transmitters and control panel circuits during mains failure.
Connector slides vertically into the alarm panel battery slot with a single locking tab; orientation marked on housing.
We bench-tested this Ni-CD pack on an OS360A panel simulator; BMS float-charged cleanly and held voltage under 50mA discharge load.
Do not run a zone test for 24–48 hours after installation — the panel needs full float charge before accepting the new cell as backup-ready.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5

Please Confirm Delivery Timeline

Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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

4.8V

Amp

2000mAh

Indexa OS360A / OS365A — 4.8V Ni-Cd Replacement Battery (AKKU-360A)

This is a 4.8V, 2000mAh Ni-Cd replacement battery for the Indexa OS360A and OS365A wireless alarm systems, along with compatible units including the 151A and 32094. It restores the backup power cell that keeps the alarm operational when mains power drops. OEM part numbers AKKU-360A and BAT4V8 both cross to this cell.

  • OS360A / OS365A series compatibility: These models share the same 4.8V four-cell Ni-Cd pack configuration, connector pinout, and charge management circuit. Swapping between OS360A and OS365A units uses the same physical cell — the panel BMS reads charge state identically across the range.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a Ni-Cd test rig, confirmed the BMS accepted the pack without fault codes, and verified the cell voltage held above 4.2V under load before shipping.
  • Post-installation float charge window: Do not run a zone or siren test immediately after fitting this cell. Allow 24–48 hours on float charge before triggering any diagnostic test. A freshly installed Ni-Cd pack will sit below the panel's low-battery threshold until the first full charge cycle completes.

Alarm panel showing low battery hours after installing new cell

The OS360A panel samples backup battery voltage against a fixed threshold — typically around 4.4V for a 4.8V Ni-Cd pack. A brand-new cell arrives partially discharged after storage and will read below that threshold until the panel's trickle charger brings it up. This is not a fault with the replacement cell. Leave the panel powered on mains for 24–48 hours and the low-battery warning will clear once the pack reaches full float voltage near 5.4–5.6V.

Alarm losing stored programming during a mains power outage after battery swap

If the panel loses zone programming or user codes during a power cut, the backup battery was not yet supplying enough voltage to sustain the memory circuit. The OS360A's memory hold voltage is lower than its alarm-trigger threshold, so the panel may appear to function normally on mains while the cell is still too flat to hold the board live. Condition the new cell for 48 hours on continuous mains power before testing backup operation. After that period, the pack should hold the panel above the memory retention voltage throughout a standard outage.

Compatible Models

OS360A OS365A 151A 32094 111A 9000ASD

Replaces Part Numbers

AKKU-360A BAT4V8

Technical Specifications

Voltage4.8V
Amp Hours2000mAh
Capacity2000mAh
Rate9.6Wh
Net Weight188g /6.63 oz
Gross Weight258g /9.10 oz
Approximate Weight258g /9.10 oz
Dimension 89.80 x 45.10 x 22.50mm

Product Highlights

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

Frequently Asked Questions

The OS360A panel cleared its zone settings during a power cut two days after I replaced the battery — why?

The replacement Ni-Cd cell needs 48 hours of continuous mains-powered trickle charging before it can sustain the panel's memory circuit through a mains outage. If the outage happened before that window closed, the cell voltage dropped below the memory-hold threshold and the board reset. Restore your zone programming, keep the panel on mains for a full 48 hours, then test backup by cutting mains briefly — the cell should now hold above 4.2V under the low-drain memory load.

My OS360A siren didn't sound during a test cycle straight after fitting the new battery — is the cell faulty?

The siren draw on the OS360A is significantly higher than the panel's standby load, and a freshly installed Ni-Cd cell may not yet deliver enough current to trigger the sounder without the voltage sagging below the siren-activation threshold. This is a charge-state issue, not a cell defect. Wait 24–48 hours for the pack to reach full float charge, then repeat the test — the cell should sustain the voltage above 4.4V under siren load at that point.

After swapping the battery in my OS365A, the panel is showing a tamper fault — what causes that?

A tamper fault on the OS365A after a battery swap almost always means the enclosure lid or battery compartment cover was not fully seated when the panel was closed. The tamper switch is a small spring contact on the housing — if the cover is even slightly misaligned, the circuit reads as an open tamper. Remove the cover, reseat it firmly until you hear or feel the catch engage, and confirm the tamper fault clears from the panel display before powering down.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • 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

Indexa OS360A Replacement Battery, 4.8V, 2000mAh, Ni-CD 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