Usually you just up the voltage and available amps. But charging faster means more heat and more wear on the battery decreasing it’s lifespan. There’s an ideal voltage and amps that depends on the number of cells and mAh. I don’t remember the formula. This question would be best asked in an rc car or rc plane subreddit. Those guys are experts at the art of charging batteries. Just ask them to dumb their answers down a little, there’s all kinds of terminology for charging rates.
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