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I've got a spare battery for my cell phone. I'm wondering what the correct way to store it would be, so as to maximize the battery time. Should I recharge the battery to 100%, then leave it aside, or should I use about 20-30% of the battery before putting it aside?

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    \$\begingroup\$ Assuming a LiPo battery? \$\endgroup\$ – Thomas O Dec 17 '10 at 11:25
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    \$\begingroup\$ @Thomas If you mean li-polymeter then yes, it says that on the back of the battery. \$\endgroup\$ – Click Upvote Dec 17 '10 at 11:38
  • \$\begingroup\$ Actually the primary battery is li-polymeter, the spare one that this question is about, says Li-ion. \$\endgroup\$ – Click Upvote Dec 17 '10 at 11:55
  • \$\begingroup\$ Nice name and picture @Click! \$\endgroup\$ – sdg Dec 17 '10 at 14:11
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This Battery University page recommends you store them at 40% charge.

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  • \$\begingroup\$ Time to go drain some batteries! \$\endgroup\$ – tyblu Dec 17 '10 at 11:48
  • \$\begingroup\$ that would be a little too low because I'd need to pick up this battery and plug it in whenever the primary dies out and I'm away from a power source. What would you recommend for that? \$\endgroup\$ – Click Upvote Dec 17 '10 at 11:54
  • \$\begingroup\$ @Click Upvote, it applies to Li-ion and Li-po batteries. It would seem it is not possible to store a battery at full charge for any long period of time. \$\endgroup\$ – Thomas O Dec 17 '10 at 12:07
  • \$\begingroup\$ @clickUpvote, it would hold about 40% charge for months, you should freeze them. \$\endgroup\$ – Kortuk Dec 17 '10 at 15:33
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The answer to this would be impacted by how often you swap the batteries, i.e. how long do you store them?

If you use a battery until it is dead, then put in the fresh one, while the now-used one is put in a charger, then I would not consider this storage at all, but merely normal use.

If you usually use just the one battery, and have a second for emergencies, then @Thomas answer makes more sense.

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  • \$\begingroup\$ Its the first (i.e I use one till its dead, then put the other in), but I only need to do this once every day or such. \$\endgroup\$ – Click Upvote Dec 18 '10 at 2:06

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