I picked up an Antigravity ATZ10 last year after my stock battery finally died on me after work at 9PM, leaving me to spend the next 2 days after work pushing it almost 2.5 miles because I was too cheap to have it towed. The new lithium battery is definitely a nice upgrade over the stock with modest weight savings (though that doesn't really amount to much in the grand scheme of things), and the built-in starter function offers some piece of mind knowing if the battery does die on me, I will at least have enough power to get it moving until I can fully charge it.
However, here a couple of precautions regarding Li-Ion batteries:
1) You can't just use your existing battery tender/charger with it, as it was designed for lead/acid batteries like the stock battery, and they will damage your new LiIon. You will need to buy an appropriate charger/maintainer, which adds significant expense.
2) LiIon batteries hate cold weather (just ask anyone with a Nissan Leaf!), and I was reminded of that firsthand this week. I was late to work on Sunday because I had parked my bike outside my house as I usually do, having forgotten that we would have near-freezing cold & rain over the weekend that our area hasn't received in a while. When I went to start the bike in the early morning after a nice 3-day weekend, I couldn't get so much as a light to turn on. The cold weather had completely drained my battery over a couple of days, even though I had fully charged it after replacing a dead headlight earlier in the week.
That being said, I was able to put the battery's built-in jumpstart button to the test & get the bike moving again. After work, I still had enough charge to start the bike once more, go home, and get the battery fully charged in the safety of the garage.
Last edited by henrypumpkin118; 12-05-2019 at 06:08 PM.