I have an i3 actually, never selling this thing! I wouldn't know if anything exists that is worthy to replace it.
Do you have the REX and are you in the USA? If so, with an app you can remove the gas-tank restriction and add the ability to maintain charge instead of only turning it on when below 30%.
alt Hacker News
Do you have the REX and are you in the USA? If so, with an app you can remove the gas-tank restriction and add the ability to maintain charge instead of only turning it on when below 30%.