This battery looks identical to my Swift 40v battery. Do you know if they are compatible?

I'm afraid it is NOT compatible. Each OEM tends to make a form-factor unique to it's range of tools (no surprise there!!)

Does this fit the Qualcast lawnmower?

Only green. Works appliances of the same voltage and ah

How long to charge at first?

Hi Gary, not too long. About 1 - 2 hours. When you're mowing/strimming etc., and you exhaust the battery, it will be quite warm and won't charge until it has cooled down (generally after about 30 mins). Hope this helps

When battery is fitted to charger both lights immediately go out, with no battery in place charger power light stays on what needs replacing ?

Under normal conditions, a flashing LED indicates that the battery is faulty - remove for 1 minute, unplug the charger and retry. If LED still flashes, replace the battery. If both lights go out, the battery is less than 10% charged - leave it in the charger and check the progress by pressing the BCI button. If the BCI remains unlit, then replace the battery.

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40V Battery. Original Greenworks 4Ah Powerful Lithium-Ion Battery for All Greenworks 40V Garden and Power Tools. Fast Charging, 3-Stage Level Control. 2 Year Warranty G40B4

40V Battery. Original Greenworks 4Ah Powerful Lithium-Ion Battery for All Greenworks 40V Garden and Power Tools. Fast Charging, 3-Stage Level Control. 2 Year Warranty G40B4

Product ID: 162550355

Details

Battery capacity
4
Battery cell composition
Lithium Ion
Brand
Greenworks
Number of batteries
1 Lithium Ion
Recommended uses for product
Herramienta

⚡40V high voltage power

💡LED charge status display

🔋4Ah long-lasting capacity

1395.65 DT

Duties & taxes included

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power your garden hustle with Greenworks’ unstoppable 40V battery!

BUILT TO LAST - Robust casing with deep discharge protection extends battery lifespan significantly.
STAY INFORMED INSTANTLY - Multistage LED display keeps you updated on battery life at a glance.
CHARGE ANYTIME ANYWHERE - No memory effect means you can recharge whenever, no downtime needed.
UNMATCHED POWER RUNTIME - 40V lithium-ion tech delivers peak performance for all Greenworks tools.
ONE BATTERY ENDLESS TOOLS - Compatible across the entire Greenworks 40V lineup for seamless tool swapping.

The Greenworks 40V 4Ah Lithium-Ion Battery (G40B4) is a high-capacity, fast-charging power source designed for all Greenworks 40V cordless garden and workshop tools. Featuring a durable, compact design with integrated deep discharge protection and a multistage LED charge indicator, it ensures maximum runtime, safety, and convenience. Compatible across multiple tools, it eliminates cords and downtime, backed by a 2-year warranty for reliable performance.

Specifications

ASIN	B07S38BDL8
Amperage	4 Amps
Antenna Location	Herramienta eléctrica
Battery Capacity	4
Battery Cell Type	Lithium Ion
Battery Weight	1.25 Kilograms
Best Sellers Rank	14,879 in DIY & Tools ( See Top 100 in DIY & Tools ) 48 in Cordless Tool Battery Packs
Brand Name	Greenworks
Compatible Phone Models	Not for mobiles
Country of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (289)
Global Trade Identification Number	06952909053172
Included Components	40V 4Ah battery
Item Dimensions	10.2 x 9.5 x 18 centimetres
Item Type Name	Battery
Item Weight	1.25 Kilograms
Manufacturer	Greenworks
Model Name	G40B4
Model Number	01-000002927007
Number of Batteries	1 Lithium Ion batteries required. (included)
Reusability	Rechargeable
Unit Count	1.0 count
Voltage	40 Volts

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