What's the current advice on recharging my iOS devices?

I try to maximize the long-term lifespan of the battery by only recharging to 100% and promptly disconnecting from the power, but I know many people who leave their devices docked and charging until they walk out the door. I also try to run down to zero/empty periodically. What's the best practice here? I've read Apple's suggestions too but wonder what others have found.


I am not an engineer [IANAE?], but I have been impressed by the advice of Steve Gibson, www.grc.com, a security researcher who has produced more than 300 consecutive weekly shows for his podcast, "Security Now."

His advice is charge lithium ion batteries early and often.

Two weeks ago he stated it thusly:

STEVE: Yes. Now, the universal agreement is that, unlike prior technologies, prior chemistries, both nickel-cadmium and then nickel-metal hydride, which was actually the same fundamental electrochemistry, those had a memory effect. So if you only discharged them a little bit and recharged them often, they would forget that there was, like, a lot more room down below the point that you were normally starting the recharge. So the logic there was run them all the way down to the ground before you recharge them. And if you can't, then you could reset their memory by deliberately doing some deep cycles.

Lithium-ion, completely different story. It has no memory. And it actually is better for the chemistry not to be running it all the way down. So there the logic is charge often. And if you are in a situation where, for example, you have access to a plug, and you've got your adapter, always use the adapter when you can.

I took this quotation from the transcript of episode 334, available here, on grc.com.

I hope he's right.


I find best to do as you have said above as often as you can, in that you fully charge and fully drain.

I try to do this where possible and it has worked well it seems with my iPhone 3G I bought in January 2009 which still holds a good few hours of charge.

  • What are thoughts about leaving devices plugged in for long periods of time? – Quacker Backer Jan 16 '12 at 21:09

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