6v 4.0Ah Rechargeable Sealed Lead Acid Battery | BG-640

v a dimensions w i
6 volts 4 Ah L: 2.76" H: 3.94" W: 1.86" 1.48 lbs 24 Wh
In stock
SKU
BG-640F1
BatteryGuy Price:
$6.09
See Chargers for this battery

Big savings on the BatteryGuy BG-640 F1 Terminal battery! The BatteryGuy BG-640 is an industry leading LOW COST 6 volt 4.0 Ah battery and an ideal replacement for 6 volt 4.5 Ah batteries when on a budget.

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Product Features

Rechargeable Battery

Rechargeable Battery

This volt SLA battery can be discharged and recharged multiple times.

Maintenance Free

Maintenance Free

BatteryGuy SLA Batteries do not require any maintenance while in use. Electrolyte levels are calibrated during factory production.

Deep Cycle Design

Deep Cycle Design

All BatteryGuy SLA Batteries are designed for deep cycling making them ideal for UPSs, Emergency Lighting, Mobile Medical Devices and many other applications.

Puncture Resistant Case

Puncture Resistant Case

The casing of this SLA battery has been designed to protect the internal components from impacts with sharp objects for extra durability in transport and use.

Corrosion Resistance

Corrosion Resistance

Both the terminals and casing are rust resistant so you won't experience loss of power because of faulty connections even in humid conditions.

Gas Safety Vents

Gas Safety Vents

We know charging equipment or the appliance that the battery powers can malfunction but our one way gas safety vents ensure there is no risk of battery explosion or fire.

Anti Buckle Separators

Anti Buckle Separators

Internal plate buckling can kill a battery outright or simply reduce its lifespan. Our AGM separators gives the plates extra support to eliminate buckling.

High Energy Density

High Energy Density

The way we make our volt SLA Batteries means you get an excellent energy per pound of weight ratio.

Optimized Conductivity

Optimized Conductivity

The materials we use inside and out have been specially selected for their optimal electrical conductivity so energy loss inside the battery is minimized.

Detailed description

Big savings on the BatteryGuy BG-640-F1 Terminal battery! The BatteryGuy BG-640 is an industry leading LOW COST 6 volt 4.0 Ah battery and an ideal replacement for 6 volt 4.5 Ah batteries when on a budget.

The BG-640-F1 is commonly used in emergency lighting, alarm systems, UPS systems, medical equipment, wheelchairs, scooters and industrial equipment.

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In Emergency Lighting it fits many units from Lithonia, Sure-Lite, Dual-Lite, Emergi-Lite, Light Alarms, LightGuard, Chloride, Prescolite and McPhilben as well as acting as a cross reference for dozens more. See our page How to find your replacement battery for more information.

Chemistry: Rechargeable Sealed Lead Acid

Dimensions: 2.76" L x 1.86" W x 3.94" H

Height w/ terminals: 4.25" H

Connector Type: F1

f1-battery-terminal

Warranty: 1 Year

Absorbent Glass Mat (AGM) Technology

Maintenance-Free Design with Spill Proof Construction

U.L. Recognized and CE Certified

Brand New, Factory Fresh

Detailed Images

6v 4.0Ah Rechargeable Sealed Lead Acid Battery | BG-640
6v 4.0Ah Rechargeable Sealed Lead Acid Battery | BG-640
SLA Battery Features
SLA Battery Features
Dimensions - 6v 4.0Ah Rechargeable Sealed Lead Acid Battery
Dimensions - 6v 4.0Ah Rechargeable Sealed Lead Acid Battery
F1 Faston Terminal - 6v 4.0Ah Rechargeable Sealed Lead Acid Battery
F1 Faston Terminal - 6v 4.0Ah Rechargeable Sealed Lead Acid Battery
Top View - 6v 4.0Ah Rechargeable Sealed Lead Acid Battery
Top View - 6v 4.0Ah Rechargeable Sealed Lead Acid Battery
Right View - 6v 4.0Ah Rechargeable Sealed Lead Acid Battery
Right View - 6v 4.0Ah Rechargeable Sealed Lead Acid Battery

Technical Specifications

product base image
Voltage 6
Amperage 4 Ah
Dimensions L: 2.76" , H: 3.94" , W: 1.86"
Product Code BG-640F1
Availability In Stock
Same day shipping available
Quantity in Stock 4533
Weight 1.48 lbs
UPC 842923100029

Product Q&A

Your Question : 6v 4.0Ah Rechargeable Sealed Lead Acid Battery | BG-640
Question:

I’m looking for a sy640 6v4ah iso9001 with spade terminal on the right front side

By Kirk R Hedrick
on 15 July, 2026
Answer:
  • We do not carry that application
    By Battery Guy
    on 15 July, 2026
Question:

I have the VEC 138BY spot light 2milcandle power. When I looked up battery for it yall popped up but 6v and I need a 12 v for it The one that came out is a DMU 12-3 12v 3 ah. Size is 4” long 2-3/4 tall and 1-7/8 wide which is also the terminal side

By Mike
on 12 July, 2026
Answer:
  • We do not carry a battery that meets those specifications.
    By Battery Guy
    on 13 July, 2026
Question:

My battery doesn't seem to be able to take a charge. How long should it take before the orange light goes off and the green light comes on. The battery is relatively new. Could it be the charger is bad?

By Martin Matthys
on 24 April, 2026
Answer:
  • Could be. You should check he battery with a volt meter.
    By Battery Guy
    on 27 April, 2026
Question:

I am searching for a KT660 (6V6.0Ah) valve regulated recharagable battery

By Denise
on 14 February, 2026
Answer:
  • We do not carry a replacement for the KT660 battery.
    By Battery Guy
    on 16 February, 2026
Question:

I am searching for a replacement battery for Brinkmann Qbeam LED night vision and this item pops up on your site but the battery in the unit is much smaller and I dont think this will fit at 4" long. Sure this is the replacement?

By chris S
on 30 December, 2025
Answer:
  • You are correct, this would not be a good replacement. Unfortunately, we do not have anything that would be a good replacement
    By Battery Guy
    on 30 December, 2025

Alerts and Warnings

If your application runs on multiple batteries, make sure to replace all of them at the same time or you will dramatically reduce the lifespan of the new batteries by mixing them with older batteries.

You have to install your replacement batteries in the same original configuration they came out and are required to use your existing hardware and cables to reconnect the replacement batteries when applicable.

It is your responsibility to verify the battery or batteries being ordered match the battery or batteries in your application prior to placing your order. Please check your:

  • existing battery dimensions (Length x Width x Height)
  • quantity needed to replace all batteries
  • voltage and amp hour requirements

Manufacturers may change requirements without notice. BatteryGuy is not responsible for incorrect orders - if you need help, please contact us.

CALIFORNIA PROPOSITION 65 WARNING

Batteries, battery posts, battery terminals, and related accessories can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to https://www.p65warnings.ca.gov.

Videos and Films

BatteryGuy Sealed Lead Acid batteries are market leading portable power products used in emergency lighting, Uninterruptible Power Supplies, wheelchairs and electric scooters, alarms, trolling motors and many other applications.

A sealed lead acid battery being cut open to reveal its internal components. Do not try this at home as sealed lead acid batteries contain harmful chemicals which may damage your skin and clothing.