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Old Apr 15, 2012, 09:49 PM   #1
OSUengineer
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Double Battery Life Mod

Hi I am an engineering student at OSU and wanted more battery life while studying and pulling all nighters on my iPhone 4. So I added a second battery!

I had to fab a new back for the phone but the upside is the back it now aluminum and doesn't need a back cover, just maybe a bumper so it is smaller than if it had an otter box. Here is the final product! It looks a little jankey but I did make it with a dremel, a file, a hammer, and some stong epoxy. Let me know if you have questions or would like me to make one for you! It is fully reversible for warranties as well. It gets about twice the battery life as the original. Enjoy!

Edit: The start of version two are the last two!
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Last edited by OSUengineer; May 7, 2012 at 09:15 PM.
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Old Apr 15, 2012, 09:50 PM   #2
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Legend! Can you show us the inside?
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Old Apr 15, 2012, 09:52 PM   #3
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Legend! Can you show us the inside?
I have a lot of homework for tonight but what the heck! i'll shoot one up here. brb
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Old Apr 15, 2012, 09:57 PM   #4
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Thumbs up

Impressive that you did that all by yourself.
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Old Apr 15, 2012, 10:02 PM   #5
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Here you go! I wanted to shrink rap the inside but I was a little too excited.
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Old Apr 15, 2012, 10:03 PM   #6
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Impressive that you did that all by yourself.
Thanks man! I have done cooler stuff, just nothing with a device that half of the people in the world own! haha
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Old Apr 15, 2012, 10:16 PM   #7
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Thanks man! I have done cooler stuff, just nothing with a device that half of the people in the world own! haha
That's a great proof of concept. Now I wonder: could you do it with a same form-factor but with a single unit? I realize that you'd probably then have to develop a custom battery for this but hey, one can dream.

Go Buckeyes! Haha. I'll be down in Columbus next month for Rock on the Range.
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Old Apr 15, 2012, 10:23 PM   #8
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Awesome.
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Old Apr 15, 2012, 10:23 PM   #9
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So you just stacked two batteries together and soldered them into parallel? How's the battery life looking?
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Old Apr 15, 2012, 10:27 PM   #10
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Originally Posted by Kyotoma View Post
That's a great proof of concept. Now I wonder: could you do it with a same form-factor but with a single unit? I realize that you'd probably then have to develop a custom battery for this but hey, one can dream.

Go Buckeyes! Haha. I'll be down in Columbus next month for Rock on the Range.
Haha! Sweet! Go Bucks!

I was thinking about the same back glass with just a spacer and making the back not be conformed to the 2nd battery. It would just be a little thicker but then wider (higher capacity) battery of the same thickness would probobly be able to take up the empty space for more than double the battery life of the original. I wish someone would sell a battery + back cover kit since there are so many replacements already.

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So you just stacked two batteries together and soldered them into parallel? How's the battery life looking?
That is pretty much it! haha It is almost exacltly twice as long as the original. I got ~23 hours of video until it was at 5%.
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Old Apr 15, 2012, 11:23 PM   #11
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I am also modding my old case to accept the mod as well and will put up pictures when I am all done. Thanks for looking.
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Old Apr 16, 2012, 12:03 AM   #12
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Pretty awesome man!
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Old Apr 16, 2012, 12:06 AM   #13
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for someone who wants to make a quick bucks. book a ticket to china and tell them to produce jumbo battery for iPhone and a compatible back cover. why there is no people doing this?

LOL..
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Old Apr 16, 2012, 02:35 AM   #14
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Awesome concept.

Im sure some will want this as the only other concept i know is the case you can buy that gives extra juice.

Personally I'm not taken with the extra bulk either concept gives.

One can only hope that Apple continually improve their battery stats.
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Old Apr 16, 2012, 02:36 AM   #15
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looks really ugly to me.
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Old Apr 16, 2012, 02:40 AM   #16
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looks really ugly to me.

Functionality over aesthetics.
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Old Apr 16, 2012, 02:52 AM   #17
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Functionality over aesthetics.
sure, but not a choice i would make...
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Old Apr 16, 2012, 02:54 AM   #18
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sure, but not a choice i would make...
I agree with you which is what i said in my earlier post
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Old Apr 16, 2012, 08:17 AM   #19
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FYI - Mophie Juice Pack Air. Just sayin'...
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Old Apr 16, 2012, 08:31 AM   #20
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FYI - Mophie Juice Pack Air. Just sayin'...
Not really the point he was trying to make.
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Old Apr 16, 2012, 08:43 AM   #21
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Not really the point he was trying to make.
You're right - I just don't get it. My bad.
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Old Apr 16, 2012, 08:50 AM   #22
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Wow..It's impressive and unique job indeed. Very well done!
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Old Apr 16, 2012, 09:05 AM   #23
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amazing. how long hold the battery now ?
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Old Apr 16, 2012, 09:12 AM   #24
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Good work!
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Old Apr 16, 2012, 03:17 PM   #25
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Since the iPhone 4 battery is about 1400MaH it would now be 2800MaH in the phone, directly connected, unliked the Juice packs or etc.
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