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I recently needed to replace the battery on my 2015 GTS. It had always been a pain, losing charge if left too long, however now I’m living back in the U.K. (from Australia), where it is significantly colder and darker at this time of year, I saved my pennies and put in the Superbatt SB072 80Ah recommended in the thread on here. This has a good deal more capacity than the old one and so far is working without fault. What I would like to know is has anyone fitted two batteries in their 86? My reason for asking is that I require a CPAP machine to sleep at night due to some breathing problems and severe obstructive apnoea. I am hoping to travel around the U.K. this summer on a photographic tour of all the places I would have loved to have seen before I got married, and emigrated 25 years ago. I never had the car or the money at the time. Then I ended up married and on the other side of the world (I have heard of murderers, back in old days, that got less than me). Anyway, not being able to afford accommodation, I intend to sleep in the car when I can, and I have a 12v DC->230v AC inverter on order. Ideally I would be able to use the old battery to power my CPAP at night and recharge it while driving during the day. I should be able to secure it into the boot area and wire it up (in parallel) such that I can switch it to charge each morning and take it out of the car’s circuitry at night. What I wondered was if my 2015 GTS86 will happily charge the two batteries in parallel? Or would I be overloading the alternator / charging circuits?