would this cage be ok for holding a battery on a Ebike conversion..?

I holds a 1.5L Nalgene water bottle, which is about 3.3lbs. Four pounds would probably be okay, but most eBike batteries weigh considerably more.

what is the spacing of the holes for attaching to the bike? my bike has holes 5.5 inches apart, which is larger than the standard hole sizing.

Max spacing of existing drilled holes is 3.75 inches. However - overall length of drilled surface is 6.75 inches. So there is room enough to drill another hole in the bracket or consider adding a Wolf Tooth B-RAD 3 or 4.

would this fit two msr 30oz fuel bottles?

I'm reluctant to say NO outright, because where there's a will, there's a way. However the bottles you mention are about 3-inch diameter each, while the cage is about 4-inches across. Thus the cage will not cradle 2 bottles of that diameter side-by-side snugly. I would not buy it for that purpose. The cage does work well for single larger diameter flasks and bottles that will nest between the side rails.

Is it a blayblad are a cup holder

It has seven platypus cupholders.

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Outpost Cargo Cage

Product ID: 13984431

Details

Brand
Blackburn
Color
Black
Material
Metal
Size
One Size
Vehicle Service Type
Bicycle

🎒Includes secure straps for bulky gear

🔩3 mounting hole sets for versatile fit

⚖️Lightweight metal design at just 4 oz

$90

Duties & taxes included

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Description

🚴‍♂️ Gear Up, Stand Out: Carry More, Worry Less!

LIFETIME CONFIDENCE - Backed by Blackburn’s limited lifetime warranty, this cage is built to last as long as your cycling passion.
STRAP IT LOCK IT GO - Integrated straps keep odd-sized bottles, bags, and gear firmly in place, so you never have to worry about losing essentials on the trail.
SLEEK BLACK SPORTY EDGE - Modern black finish complements any bike style, making your setup look as sharp as your ride.
UNIVERSAL FIT ZERO HASSLE - Three sets of mounting holes ensure seamless compatibility with a wide range of bike frames—no compromises on your ride.
LIGHT AS AIR TOUGH AS STEEL - Crafted from durable metal weighing only 4 ounces, it balances strength and minimal weight for peak performance.

The Blackburn Outpost Cargo Cage is a lightweight, metal bicycle accessory designed with three mounting hole sets for universal frame compatibility. It includes secure straps to hold bulky or irregularly shaped gear, making it perfect for adventurous cyclists who demand versatility and durability. With a sleek black finish and a limited lifetime warranty, it’s a reliable companion for every ride.

Specifications

ASIN	B00NT4KXBA
Automotive Fit Type	Universal Fit
Best Sellers Rank	#46,275 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #56 in Bike Water Bottle Cages
Brand Name	Blackburn
Color	Black (Updated)
Compatible with Vehicle Type	Bicycle
Customer Reviews	4.6 4.6 out of 5 stars (1,880)
Handle Type	Strap
Included Components	Bottle Cage
Item Dimensions L x W x H	22"L x 4"W x 20"H
Item Highlight	Blackburn Outpost Cargo Cage
Item Type Name	Blackburn Outpost Cargo Water Bottle Cage (Black, One Size)
Item Weight	4 ounces
Manufacturer	Blackburn
Manufacturer Part Number	7149605
Manufacturer Warranty Description	Subject to a limited lifetime warranty for the lifetime of the original purchaser.
Material Type	Metal
Model Number	7149605
Mounting Type	Strap Mount
Number of Items	1
Size	One Size
Strap Type	Basic
Style Name	Sporty
UPC	196178238489
Unit Count	1 Count

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TrustScore 4.5 | 7,300+ reviews

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Fantastic experience overall. Will recommend to friends and family.

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The product exactly matches the description. Very satisfied with my purchase.

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$90