Estry

Battery for Avaya INDEX DT20 20DT WT9620 7420 7430 7434 7439 7440 7449 4145 4146 NT7B65KSE6 NTTQ47KAE6 and NT7B80BXE6 NT7B65LDE6 NT7B65LD

Q: How do I confirm this battery fits my device?

Match your device against the Compatible Model list, or compare the part number printed on your original battery. Still unsure? Email us with your battery details or photos and we will help you confirm.

$16.99 USD

~~$0.00 USD~~ $16.99 USD

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Title 700mAh

12-Month Warranty30-Day Easy ReturnsShips from US in 48hUN38.3 & ISO9001 Certified

This is a 700mAh 3.6V Ni-MH replacement battery for Avaya INDEX DT20, 20DT and more, compatible with battery part numbers NT7B65KSE6, NTTQ47KAE6 and NT7B80BXE6, NT7B65LDE6 and more.

Battery Specifications

Type:	Ni-MH
Weight:	59.0g
Dimension:	45.031.110.5mm
Category:	Cordless Phone
Voltage:	3.6V
Rate:	2.52Wh

Compatible Brand

Avaya

Compatible Model

INDEX DT20
20DT
WT9620
7420
7430
7434
7439
7440
7449
4145
4146

Compatible Battery Part Number

NT7B65KSE6
NTTQ47KAE6 and NT7B80BXE6
NT7B65LDE6
NT7B65LD

⚠ Safety Warnings

Do not disassemble, puncture or modify the battery.
Never short-circuit the terminals or expose to heat / fire.
Do not mix with different batteries or chargers.
Recycle used batteries at designated collection points.

Why Choose Estry

✓ Grade A Cells — Premium cells with stable discharge and low self-discharge.

✓ Real Capacity — Capacity tested to match or exceed the original battery.

✓ Strict QC — Every battery passes charging/discharging and safety checks.

UN38.3 tested for safe transport. MSDS available upon request. Manufactured in an ISO9001 certified facility.

FAQ

How do I confirm this battery fits my device?

Match your device against the Compatible Model list above, or compare the part number printed on your original battery. Still unsure? Email us with your battery details or photos and we will help you confirm.

What is the warranty policy?

This battery is covered by a 12-month warranty against manufacturing defects, plus 30-day easy returns for peace of mind.

How fast will my order arrive?

In-stock orders ship from our US warehouse within 48 hours on business days.