We promise the weather will be warmer!

I haven't tried 2 helmets in the top case, but I'm pretty sure that if they will fit they will need any comm unit removed.  Either my Nolan N104 or my Scorpion AT950 will both fit in a side case of the Trophy's luggage without the comm (Sena) unit on them.  Both the Sena units i have come off really quick and easy if necessary so it's not a big deal, and being able to use a side case means when I'm not traveling far enough and long enough to need all the luggage I can stow a helmet safely out of the way when I park for a while.  Once my back is OK to pick up my top box I'll check to see if 2 of my modular helmets will fit.

NASA also won't use ANY Rohs compliant materials in their systems due to the "tin whiskers" issue.  They have their own set of rules.  Soldering onto batteries is something I won't be doing due to the risk involved where those less knowledgeable about said process are concerned.  I would almost try to bend the tabs into the correct position on a battery that had tabs already installed on it.

My unsealed ones use 2032's, but the sealed unit has the tab attached over the last two digits of the battery type and that battery is good, so I don't want to clip the connections and forcibly remove the tab until I have to replace one of them.  My front tire still has that sealed unit in it, but the rear has been replaced and is the unsealed version.