I test drove the Bolt. My biggest dislike is the braking, it feels like it wants to roll the stop. I mashed the brake at the last minute a few times. Maybe something I can learn to live with, but my first impression was meh. I also didn't like the angle of the head rests, the position of the steering wheel (might be telescoping but I didn't find that adjustment) and the lack of center back seat head rest.
Good one. I'd say, just test it out this winter. If you charge for one single hour at work, you get 7 miles extra and a slighlty pre-warmed battery. Even if you do this 100 times this winter, you are at only 200$ extra. Next summer it will still give you the same range as in winter with 1 hour of recharging. So now you have postponed a newer car for a year. 7% return on a 5500$ battery investment is 385$. 7% on a 19K car for one year is 1330$. As electrics and batteries come down in price over time, you might save even more. Pre-heat the car if possible, maybe with a hot water bottle inside :-)
Yeah, my current thought is just to deal with it this winter. Last winter I only had to charge maybe 7 times. I've switched over to "winter mode" and have the car charging to 100% now (autumn chill is in the air) and man, it's so much nicer to have a 60 mile estimate when I leave the driveway in the morning. Say 30 times this winter, 10 of those for 2 hours, and that's 40x$2 = $80. The biggest hassle of that is making the time to move the car from one parking lot to the other (and possibly back). As a Mom I feel like I need to be able to leave at a moment's notice to pick my little one up from school so I might do it in the morning, but then I miss out on the sweet, sweet preheat as I'm heading out the door for the drive home.
I would replace the battery. It really comes down to either replacing the battery and having $10k invested in almost new like car, or buying a brand new car for $19k and getting double the range. I don't think double the range is worth $9k, especially with your driving situation. But if you really want the new one and have the money, then go for it.
The electric options for more range as I see it:
No replacement, plug in at work and buy new tires: $550, 7 miles, good for 1 year
New Battery and tires: $6000-8500, 23 miles, good for 7 years (or less, depending on rust)
New-to-me 2015 Leaf: $14,000 - $3500 trade = $11,500, 30 miles, 10 years until I need a battery replacement
2019 Leaf $19,000 - $3,500 = $15,500, 100 mile improvement, 15 years
2019 Bolt $25,000 - $3,500 = $21,500, 188! more miles than my current car, also good for 15 years until rust does it in.
As far as I know leaf don't have an effective cooling /heating system for battery packs, while 2019 leaf will have one. If you live in cold places that is important. I would try to wait out until the 2019 leaf with climate controlled battery packs.
The 2012 and later Leaf has a battery heater for very cold days. You are correct that it has no cooling, and that is a great thing that will come with the 2019, along with more range (I think a 60 kWh battery is rumored, so it will be in the 200 mile ballpark with the Tesla Model 3, Chevy Bolt, Hyundai Kona).
Downside of waiting 'til 2019: Chevy and Tesla will have reduced Federal tax incentives, Nissan might begin phaseout.
I still plan to test drive the latest Leaf, but I'm 60% confident that I'll tough it out this winter and make my move next summer.