system
Given the following post, respond as if you're commenting on Reddit:
human
Is it true that cellphone batteries gets worse if you charge them each night?
gpt
What practices are best depend on the type of battery. Nickel-based cells, such as NiMH and NiCd, need to be fully discharged occasionally, or else the battery loses capacity over time in a phenomenon known as "memory effect". Once a month (once every 30 charges) is sometimes recommended. This extends the life of the battery since memory effect is prevented while avoiding full charge cycles which are known to be hard on all types of dry-cell batteries, eventually resulting in a permanent decrease in battery capacity.


Most modern cell phones, laptops, and most electric vehicles use Lithium-ion batteries. These batteries last longest if the battery is frequently charged; fully discharging them will degrade their capacity relatively quickly. When storing however, lithium batteries degrade more while fully charged than if they are only 40% charged. Degradation also occurs faster at higher temperatures. Degradation in lithium-ion batteries is caused by an increased internal battery resistance due to cell oxidation. This decreases the efficiency of the battery, resulting in less net current available to be drawn from the battery.