I have the 24 Volt system on and my 1441 started great, stock main battery a little scooter style in rear, i just charge them with battery tender, 4 years no issue!
Now I have 1630 with 18.5 to 1 compression, took stock battery out and replaced it with a Yuasa ytz14 s battery alot better cranking amp and still little battery in back, No issues even hot!
I was told by 2 people in race comunity that unless you are looking to save every ounce, Ion batteries can be trouble, the hate the cold and lose cranking amps below like 60 degrees and they die without any warning!
Ryan Schnitz just did this batteru Yuasa ytz14s for me and fires up clean, old stock battery from 2011 was tired, 1630 beat it up!!