Why do the price list and the datasheet give different capacities?

They are quoting to different precision. CSB's distributor price list carries this part at 8.5 Ah, a catalog figure, while the 2026 per-part datasheet rates it at 8.80 Ah at the 20 hour rate to 1.75 volts per cell at 25°C, a measured one. The datasheet is the document a runtime calculation should use. On a submittal that asks for the manufacturer's nominal rating, 8.5 Ah is what CSB publishes commercially and either figure can be defended with the document it came from.

Does the extra capacity change the discharge limit?

No. Both M7 blocks are rated 130 amps for 5 seconds, because that ceiling is set by the 0.250 inch F2 tab and not by the plates. Where the 1285 pulls ahead is sustained power: 183 watts per battery at 15 minutes against 148, and 5.62 amps for an hour against 4.47. On a short, hard load the two behave alike; on a 20 minute hold the 1285 is the one with margin left.

Is this rated for the same cold as the rest of the XTV range?

Yes. Every XTV part CSB publishes carries the same -20°C to 50°C discharge window and -20°C to 40°C charge and storage window, from this 8.5 Ah block up to the 110 Ah XTV121100. The construction that earns that rating does not change with size. What changes is how much energy sits behind it, and on an M7 footprint this is as much as the range offers.

Is the flame retardant case standard?

Not on this part. CSB's datasheet describes the container as ABS to UL 94-HB with the 94-V0 flame retardant version available on request, and the price list prices FR as a surcharged option across the XTV range rather than standard. If the enclosure specification calls for a V-0 case, name it on the order and ask the specialist to confirm the build in writing.