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I wonder if an off board charger would be better than the OBC or Charge Tank even.

When I bought my SR with Charge Tank last year I checked the logs to compare the battery charging and noted that the 6kW Charge Tank increased the battery pack temperature less than the 1.2kW OBC did for the same amount of SOC increase.

For example, OBC charging from 53% to 100% increased the battery temperature from 19C to 32C (in 5 hours), whereas the 6kW Charge Tank charging from 50% to 100% increased the batttery temperature from 19C to 26C (in 1 hour 30 minutes).  The logged ambient temperature (I'm not sure where the sensor for that is) rose from 12C to 20C for the OBC but from 14C to 25C for the Charge Tank for those two charges.

I presume the OBC heats the battery more because it is mounted below the battery pack and conducts heat into it, whereas the Charge Tank is mounted above the battery pack and there is a gap between them (plus it has cooling fans blowing heat away from the battery).

I can't help noticing that whenever I read of or see videos of people crashing on a Zero due to the rear wheel spinning up, it always seems to be a DSR which has semi-offroad tyres (or semi-onroad tyres!).  Those tyres just don't seem to have enough grip for road use when the road conditions are less than perfect.  Perhaps the higher centre of gravity compared to an SR doesn't help either?

It reminds me of an event from my teenage days (a long time ago) when I was a passenger in my brother's car and we were following a guy riding an offroad bike, fitted with knobbly tyres, on wet roads (and it was raining).  As the rider slowed to turn into a side road my brother said "He must be mad to be riding that bike on wet roads with those tyres, I bet he comes off when he turns", and as soon as had he finished talking the rider very slowly turned, at about walking pace with the bike almost vertical, and bang - in a blink of an eye the bike slammed him to the ground!  Offroad tyres are not good for riding on wet tarmac roads!

I bought an SR back in June and I've only ridden it in the dry so far, and the rear has lost traction briefly on a few occasions when accelerating flat out in a straight line (with the bike upright so I didn't have any problems), but other than that the Pirelli sports road tyres seem to have plenty of grip.  Those rare occasions were usually the result of a small bit of gravel in the road that I hadn't spotted or couldn't avoid, but the tyres quickly gripped again.  I'm fairly sure that my bike wouldn't have crashed like that DSR did in the videos in previous replies.  (Hopefully that isn't my "famous last words"!)

Would love to use them, but it's around 2 hours and 100 miles from me. Questionable if I'd even get there on a full charge.

They do offer mobile servicing - they will come to you and service your bike.  See their website.  They say, "Regarding costings of our mobile servicing our standard fee is £145 incl VAT (standard workshop based service is £72 incl VAT)".

I charged my SR to 80% today, then about 30 - 45 minutes later (I think) I started the bike to go for a ride, and it was indicating 85% state of charge.  So it had gained 5% of charge while not plugged in!  I can only guess that the battery may have cooled slightly in that time, which affected it's estimate of SOC, but I'm still surprised it would indicate 5% more.  The electric cars that I have had have never done that.  I've had the bike since June and this is the first time that it's done that.  Is it normal for Zeros to do that?

How many waste heat does Zeros Calex charger produce? The 1,3kW charger on my 2016 SR may had ~90W. A 3kW probably around 250W.

I've recently bought a Zero SR with a charge tank, and I downloaded the MBB logfile so that I could see the difference it made to battery temperature when using the charge tank.  It seems that using the standard 1.3kW on board charger heats the battery up more than the 6kW charge tank charger for a simllar (or greater) amount of charge.  So it seems to be better for the battery to use the faster charge tank charger.  There's a gap between the top of the battery pack and the charge tank, so even when the cooling fan is going full pelt it doesn't seem to add much heat to the battery pack, unlike the 1.3kW charger which is mounted under the battery pack and which conducts heat directly to the battery pack.  Maybe I'll use the 1.3kW charger in the colder winter months, although if it's too cold I won't be riding the bike anyway!