@Rizzle On the block question: I can't give you a specific click path without risking sending you somewhere that doesn't exist, but the forum does have an ignore/block function - check your account preferences or the dropdown on the offending member's profile. That's your best starting point.
On
@sethimus's actual point though, he's technically right that the new 700Wh cylindrical battery physically can't fit a frame designed for the flat-pack form factor, and the RS181.2 wasn't designed around it. The thread confusion is real and understandable. What the official Crestline site
does confirm is that the RS181.2 accommodates either a 600Wh or 800Wh flat-pack battery, both described as easy to remove.
The Forge specifically lists AVINOX 600 to 800Wh as its battery compatibility.
No mention of the new 700Wh cylindrical on any RS181.2 product page. So
@Wah's read looks correct - the RS181 takes 600 or 800Wh batteries, and the new cylindrical 700 with its different form factor is a separate proposition. Your forged frameset arriving in June should support both existing flat-pack options. The 800Wh you originally asked for remains very much a valid choice.