Chibimagic's Weblog

External iPhone batteries

Posted on: October 25, 2012

I decided to get an external battery pack for my iPhone recently. I didn’t know which capacity of battery to get, so I started researching prices, capacities, and efficiencies.

The main thing you need to know is that external batteries have an efficiency of 65-70% when charging off them. iPhone batteries range from 1150 – 1440 mAh. So you need about 2200 mAh of external battery for each full iPhone charge.

I got a Griffin USB Reserve Power, which has 950 mAh and claims to charge an iPhone 3GS (1219 mAh) to 50%, giving 64% efficiency. Thus I can expect it to charge my iPhone 5 (1440 mAh) to 42%, which it hits on the nose.

This PhoneSuit Elite Battery Case has a 2100 mAh battery and claims to charge the iPhone 4 (1420 mAh) and iPhone 4S (1432 mAh) to 100%, which would give it 67-68% efficiency.

The Just Mobile Gum is 2200 mAh and claims to charge your iPhone to 90%. Assuming an iPhone 5, that’s 59% efficiency.

And finally, the Mophie Juice Pack Boost is 2000 mAh and claims to charge your iPhone to 100%. Assuming an iPhone 4, that’s 71% efficiency.

In summary:

  • 65 – 70% typical efficiency
  • ~2200 mAh in external battery for each full iPhone charge

iPhone internal battery capacities:

  • iPhone: 1400 mAh
  • iPhone 3G: 1150 mAh
  • iPhone 3GS: 1250 mAh
  • iPhone 4: 1420 mAh
  • iPhone 4S: 1432 mAh
  • iPhone 5: 1440 mAh

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s


  • None
  • Marketing Consultant: You're an great writer. You have brought up some really interesting insights. Just wanted to say fantastic blogs! I know tons of people see your write
  • optical franchise opportunities: Right now it looks like Wordpress is the preferred blogging platform out there right now. (from what I've read) Is that what you are using on your blo
  • startup speaker: Interesting content. A magnificent article. It is very informative and you are obviously very knowledgeable in this area.

Categories

%d bloggers like this: