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Estimate run time and check whether your pack can supply the current. Example values are a 2S drift pack.
Run a timed pack, then check how many mAh your charger puts back. That gives your real average draw, which replaces the value above.
Stop around 80% used (about 3.7–3.75 V per cell resting) for LiPo life. Manufacturer C ratings are usually optimistic, so leave margin.