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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🚴‍♂️ Lock in your essentials, ride with confidence!

SECURE CARGO STABILITY - Silicone-backed straps prevent any jostling or loss on the move
EFFORTLESS INSTALLATION - Mounts easily to two standard bottle cage bosses for quick setup
LIGHTWEIGHT YET DURABLE - Only 164g including straps—ride fast without extra bulk
HEAVY DUTY CARRYING POWER - Supports up to 8.8 lbs of gear without compromise
UNIVERSAL FRAME COMPATIBILITY - Three mounting hole sets fit a variety of bike frames seamlessly

The Blackburn Outpost Cargo Cage is a lightweight, versatile bike accessory designed to carry up to 4 kg (8.8 lbs) of cargo securely. Featuring three sets of mounting holes for broad frame compatibility and silicone-backed straps to keep your gear stable, it mounts easily to standard bottle cage bosses. At just 164g, it balances durability with minimal weight, perfect for the active cyclist who demands reliability and convenience.

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€ 101.50

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Finlandstore

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Manufacturer	BLACKBURN
Brand	Blackburn
Model	Outpost Cage Bottle Cage
Product Dimensions	30.48 x 15.24 x 10.16 cm; 113.4 g
Item model number	7149605
Manufacturer part number	BLBCOUT
OEM Part Number	Blackburn Outpost Cargo Water Bottle Cage (Black, One Size) (Updated)
Item Weight	113 g

Blackburn CARRYING CAGE BB OUTPOST CARGO CAGE 23#, Grey

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