What is different about the WT build if the discharge tables match the standard XTV1272F2?

The tables match because the plate set is the same 7.2 Ah design. CSB's published claim for the WT range is about what the battery survives rather than what it delivers: pure lead construction for charging efficiency, operation in a high vibration environment and better cycle performance, with the flame retardant case fitted as standard. A turbine hub cycles the battery every time the pitch system fires and shakes it the rest of the time, which is a different life from a cabinet on a pole. If the application is a stationary cabinet, the standard XTV1272F2 does the same electrical job on the same 3 year term.

Is this a gel battery?

No. The current CSB datasheet for this part describes it as an absorbent glass mat battery with pure lead construction, and it is charged on the AGM float window of 13.5 to 13.8 volts per battery. Older CSB literature for the XTV range used the phrase "hybrid gel"; the current sheet does not. Charge it as an AGM battery.

Can it be stored in the hub over winter?

Storage is the one place the WT sheet is tighter than the standard XTV sheet: -15°C to 40°C, against -20°C on the standard part, while discharge and charge are rated to -20°C on both. In practice a pitch battery is on charge whenever the turbine is energized, so the storage limit applies to spares on the shelf and to a turbine that has been de-energized for a season. Bring stored spares to a full charge before they go up the tower, and within 6 months of the last charge at room temperature.

Why does the datasheet show 7.40 Ah when the part is a 7.2?

CSB badges the XTV range by nominal 20 hour capacity, and the nominal figure on this sheet is 7.2 Ah. The capacity table on the same sheet, read at the 20 hour column to 1.75 volts per cell, gives 7.40 Ah. The difference is a measured figure against a rounded catalog number, and both are CSB's. Size a pitch pack on the nominal 7.2 and treat the extra as margin.