estimate its lifetime, obtaining a battery life of roughly 12 years for the Pyrenees and around 5 years for the case Tindouf. For Li-ion batteries, both the cycle and calendar aging must be considered, obtaining more than 20 years of battery life estimation for the Pyrenees and 13 years for Tindouf.
Bosch, DeWalt, Metabo HPT, Makita, Milwaukee Tool, EGO, and Ridgid all warranty their Lithium-ion batteries for 2–3 years. That’s a real good indicator of their minimum expectations for those packs. Move to a company like Greenworks 60V and you can find a 4-year battery warranty.
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The Conclusion. In conclusion, the lifespan of a 3 cell 41 Wh Li-ion battery can vary depending on several factors such as usage patterns, discharge rates, and overall battery health. On average, these batteries can last anywhere between 300 to 500 full charge cycles before experiencing a notable decrease in capacity.

Extending the life of the lithium-ion battery in your power tools. University of Michigan. 5 / 5. Nine key tips for extending the life of lithium-ion batteries. University of Michigan.
Here are some general guidelines from the U-M researchers to maximize lithium-ion battery lifetime, along with a few specific recommendations from manufacturers: Avoid temperature extremes, both high and low, when using or storing lithium-ion batteries.
Finally, extensive cycling of a Lithium-ion battery can also affect capacity over time. See this article for some discussion on trading off charge capacity and depth of discharge. It seems like if possible, the optimal way to use a battery in terms of lifespan would be to charge it to 3.92V (~60%) and draw it down 10-20%, and then recharge.
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li ion battery life span