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Rectangular 4.8V 5000mAh Ni-MH battery pack, dark wrap with label

Estry

Estry 3900 4.8V 5000mAh Ni-MH standard battery

SKU CH-ZF00-6QVWZ MPN 3900

4.8V 5000mAh Ni-MH replacement pack for laser alignment models 3900, 3920, LB-1 and LB-2

  • Specifications4.8
  • Battery Pack1 Year
  • Exact-fit replacement for laser alignment models 3900, 550634, 3920, LB-2, LB-1
  • 8V 5000mAh Ni-MH chemistry delivers 24.0Wh runtime for extended field use
  • Overcharge, over-discharge, over-voltage and short-circuit protection safeguards battery life
  • Certified to ISO9001, RoHS, CE, UN38.3 and MSDS standards for safety and quality
  • Compact 120.15 x 64.77 x 32.59mm pack weighs 652.0g for easy handling

Direct replacement for laser alignment tools

The Estry 3900 is a 4.8V 5000mAh Ni-MH battery pack built to match the original specifications for models 3900, 3920, LB-1, LB-2 and part numbers 550634 and 0667-01. It delivers 24.0Wh and is certified to ISO9001, RoHS, CE, UN38.3 and MSDS standards.

Simple drop-in installation with polarity care

The pack fits the existing battery compartment without soldering or tools. The main risk is reversing the connector polarity during insertion, which triggers the built-in short-circuit protection and prevents operation. Confirm the model and part number before purchase to avoid fitment issues.

Ni-MH chemistry limits runtime and charge speed

The 4.8V nickel-metal hydride design provides stable voltage but lower energy density than lithium alternatives, so runtime per charge is fixed by the 5000mAh capacity. Self-discharge occurs during long storage, and the pack requires a compatible Ni-MH charger; fast-charging or lithium charge profiles will damage the cells.

Highlights

  • Exact-fit replacement for laser alignment models 3900, 550634, 3920, LB-2, LB-1
  • 8V 5000mAh Ni-MH chemistry delivers 24.0Wh runtime for extended field use
  • Overcharge, over-discharge, over-voltage and short-circuit protection safeguards battery life
  • Certified to ISO9001, RoHS, CE, UN38.3 and MSDS standards for safety and quality
  • Compact 120.15 x 64.77 x 32.59mm pack weighs 652.0g for easy handling

Specifications

BrandNi-MH
Model5000mAh
Specifications4.8
Battery Pack1 Year

Questions about this item

How can I confirm the 4.8V 5000mAh pack is working after installation?

Insert the pack into your laser alignment device and verify it powers on normally; the built‑in overcharge, over‑discharge and short‑circuit protection will engage automatically during use.

What comes in the box and what must be purchased separately?

The box contains one 4.8V 5000mAh Ni‑MH replacement pack (120.15 × 64.77 × 32.59 mm, 652.0 g); no charger or cables are included.

Which version should I choose for a 3900 or 550634 model?

This single 4.8V 5000mAh version (part numbers 0667‑01 / 550634) fits all listed compatibles — 3900, 550634, 3920, LB‑2 and LB‑1 — so select it when your device matches any of those.

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