[Q] Any way to limit charge to 90% or 85% ?

You have no option except to manually unplug the charger when it reaches 90%.
There is no way a device can resist the current flowing into it through the same port it accepts the current, AFAIK.

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I dont think theres any app that can do that. What i recommend is that use a battery app that alerts you when you reach a certain percentage.

dewd!
Why the hell you think that you'll ever notice a difference in battery life span if you actually really only charge it to 90%? That's as much as true as it being wrong. You should start reading real books made of paper instead of reading the internetz-for-randoms, srsly.

Look it that way, your battery life span in dependant way more on how the battery is drained/charged, than to how much of its capacity in being recharged.You need to use that very same battery for at least 10 years to actually see a difference in life span, due to charging it to 90% instead of 100%....... and then again, you'll need a vast sample of batteries in lab conditions to even be able to tell if the difference is actually caused by this or that.

Use your battery as a normal user, it will last you probably more than you'll actually will own your moto g.
Also the phone charging circuitry limits the current to ~200mA/h after the battery is charged up to 90%.