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 Rank: Beginner Level 2 Groups: Registered
Joined: 08/12/2018 Posts: 17 Points: 53 Location: Ireland
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The app shows a percentage of battery use, at what percentage should we start the recharge at? As I think waiting on r2's red light to come on could be when the batteries are too low thus shortening the life of them. Any thoughts on this guys.I was thinking around the 30% mark, but then how accurate is the app on the batteries.
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 Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Depending on the quality of the battery, they generally have a limited lifespan of 300-500 cycles (a cycle being one theoretical full discharge and charge) after which their capacity becomes reduced to the point of being unusable.
Depending on the level of discharge, the number of theoretical cycles the battery can provide changes. For example, a battery taken to 100% depth of discharge (DoD) should last for 300-500 cycles, but a battery taken to only 50% DoD will be able to provide 1200-1500 cycles. Battery ageing is increased by high DoD, storage and usage at high temperatures, and if the battery is stored at a high state of charge.
Lithium-ion batteries degrade over time. This degrading results in the capacity becoming reduced, and is caused by battery ageing. Batteries age simply through normal use, but ageing is also affected by the conditions of storage.
There are a few aspects that need to be considered when storing R2-D2, that of battery degradation, and self-discharge. Never store R2-D2 in a fully discharged state (or as a result of self-discharge during storage) as this will degrade the batteries. During storage, R2-D2 (and any spare batteries) should be maintained in a partially charged state. Any spare batteries should be stored within insulating containers that are designed for this purpose (often supplied with the battery purchase).
A point of safety: Lithium-ion batteries must be considered fragile and should never be crushed, exposed to flames or excessive heat. They can become damaged if dropped and may leak or suffer from 'thermal runaway' if the damage creates an internal short circuit. Never use damaged cells and dispose of them at a recycling centre.
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Rank: Beginner Level 2 Groups: Registered
Joined: 08/12/2018 Posts: 17 Points: 53 Location: Ireland
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So say as soon as app says 40% battery left then put on charge?
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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The choice is yours, though 40% also means less charge time.
Be mindful also not to store R2 in a high state of charge.
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Rank: Beginner Level 2 Groups: Registered
Joined: 08/12/2018 Posts: 17 Points: 53 Location: Ireland
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Thanks for that appreciate your time Merry Christmas to you.
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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And to you Bren 
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