Will my existing glc363l20 battery From my old strimmer be compatible?

I don't know this particular battery, but Since I think B&D only make one model of 36V battery, and you have a 36 in the product code, it should fit.

How long should it take to fully charge the battery, I've had it on charge nearly all day and the green light is still flashing

Nooo, that’s not right. 2 or 3 hours perhaps, or longer if it’s been run flat. If the green light is flashing, it does sound connected though. Check how many bars have lit up, and turn it off for now. The charger won’t work if your battery overheats (through work or this -) Best of luck.

Does the bl2036 h4 battery fit this?

As far as I know Black and Decker only make one 36V battery. I am sure the battery you mention is 36V - that is what the 36 in the product code means, so this battery will fit your 36V strimmer. Compatible batteries can also be found online, often a lot cheaper and also higher capacity - the 20 in the product code means 2.0 Amp hrs, and you can get a 3.0 Amp hr compatible battery battery cheaper than the authentic B&D 2.0 one. My experience over several years is that the compatibles are generally of good quality.

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BLACK+DECKER Cordless Grass Strimmer 36V BATTERY NOT INCLUDED (Bare), BCSTA536B-XJ

BLACK+DECKER Cordless Grass Strimmer 36V BATTERY NOT INCLUDED (Bare), BCSTA536B-XJ

Product ID: 310736136

Details

Assembly required
No
Brand
BLACK+DECKER
Colour
Orange/Black
Cutting width
33 Centimeters
Global Trade Identification Number
Item weight
3200 Grams

⚡36V cordless power

🌀AFS Automatic Line Feed

🔄Trim & Edge flip head

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$455.03

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Description

🌿 Cut Loose, Edge Sharp — Power Your Lawn Like a Pro!

SMART AUTOMATIC LINE FEED - AFS technology feeds line automatically, so you stay focused on your lawn, not the tool.
BRUSHLESS MOTOR EFFICIENCY - Longer runtime and enhanced power efficiency mean more lawn care with less recharge downtime.
EFFORTLESS PRECISION CUTTING - Flip the head to switch seamlessly between trimming and edging for a perfectly manicured lawn.
CORDLESS FREEDOM WITH 36 V POWER - Enjoy tangle-free gardening with powerful cordless operation—battery sold separately for flexible use.
ERGONOMIC GRIP LIGHTWEIGHT DESIGN - At just 3.2 kg with top and middle grips, it’s built for comfort during extended use.

The BLACK+DECKER BCSTA536B-XJ is a 36V cordless grass strimmer featuring a versatile flip head for trimming and edging, an innovative Automatic Line Feed System for uninterrupted work, and a brushless motor for superior power efficiency and longer runtime. Lightweight and ergonomically designed, it offers professional-grade performance without the hassle of cords. Battery not included, compatible with BLACK+DECKER’s 36V platform.

Specifications

ASIN	B085GPXN71
Best Sellers Rank	24,644 in Garden ( See Top 100 in Garden ) 201 in Grass Trimmers
Brand Name	BLACK+DECKER
Colour	Orange/Black
Country Of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (812)
Cutting width	33 Centimeters
Global Trade Identification Number	05035048726891
Included Components	36v Strimmer Only
Is Assembly Required?	No
Is Product Cordless	Yes
Item Dimensions L x W	115.6L x 22.6W centimetres
Item Type Name	Strimmer
Item Weight	3200 Grams
Manufacturer	BLAUG
Manufacturer Part Number	BCSTA536B-XJ
Manufacturer Warranty Description	2 year manufacturer
Model Number	BCSTA536B-XJ
Number of Items	1
Pattern	Single
Power Source	Battery Powered
Recommended Uses For Product	Lawn and weed trimming, garden edging
Size	Sans batterie, ni chargeur
Speed	5500 RPM
Style Name	Stand Alone
Unit Count	1.0 count

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