Introduction
Smartphones are very power hungry. A stock battery will last at most one day or less under normal usage. This guide will show you how to double your battery. Double time, double fun.
Notice:
Playing with Lithium-ion battery has some risk. If you don't have the basic skill and knowledge, STOP!
Modifying Lithium batteries might violate laws in your country or region. It's all your own responsibility!
FAQs (possibly)
Q: Can I mix batteries, one new and the other old?
A: Short answer: YES! Long answer: Google it.
Q: Can I do this on non-Samsung phone/battery?
A: Yes. This Samsung Galaxy S Duos / S7562 is just an example. Almost any phone, which you can cut or rebuild the back case, can load more batteries than it's designed to.
Q: The best way to balance voltage between batteries?
A: My opinion: Discharge them to below 3.5V or use them until auto cut off. discharged battery has higher impedance and less energy, both are good for safety.
Q: What should I do when SHTF?
A: (not likely to happen if you follow this guide) Cut the wire if you have time and right tool. Drop the batt into water and step back. Inform people nearby. Do not touch the batt until it cooled off.
Parts
-
-
Peel skin off, but not all the way off, from ONE battery.
-
Slice some skin off from the other. both sides. Until the black plastic PCB cover and be easily removed.
-
-
-
Put 2 batteries together and aligned, belly to belly. Bind them with the peeled skin.
-
Remove both black plastic PCB covers.
-
-
-
Bridge one B+ to anotherB+ first. Use soldering iron and solder.
-
Then, P- to P-.
-
Leave Both B- open!
-
-
-
Cut 2 notches on each plastic PCB covers. At the position of bridging wires, and faces each other. So the wires won't lift the PCB covers.
-
These are not quite finished.
-
These are what I'm talking about.
-
Put both PCB covers back. If you bond batteries too tight, may need to loose a little bit, then tighten again later.
-
-
-
Use the skin of the peeled bat to fully bond them.
-
Cover the notches and wires with some tape. Shown PI/Kapton tape will be the best choice, anything thin enough and isolate is ok.
-
The skin is a little short for 2 cells. The exposed metal should be covered also. They are the positive terminal. You don't wanna short-circuit something, do you? (not yet covered in these photos)
-
-
-
Double battery vs single battery. :-P
-
The back case won't fit double battery. Cut them the way you like.
-
(Not quite) Finished. Maybe I should 3D print some extra cover and glue it to the back case.
-
Actually I did 3D print a frame, and glued a trimmed RFID card as back cover. They work well!
-
Double power, double juice.
60 comments
Good idea thanks :)
Wow, i dont see pages like this anywhere else, i have a xolo phone, in india, its battery dosent have any b+/- or p+/- terminals, it just has + - and the middle one, can i wire + and - in parellel to get the doubled MAH?
No no no thats is doubling the voltage and mah u just want to double mah. Because u double both and u now have a fried phone
In parellel, but only if two batteries are within very few mV of each other. They MUST be same mAH, or you will kill lower rated battery. First cut thin plastic or fireproof cardboard spacer, and place it between cells. Tape alined cells. Desolder top charging board from battery. Remove black plastic from top cell. Solder tabs + to +, then - to -. Nip lower black plastic, so tabs can fit under single charging board. Cover top battery tabs with tape or hot glue. Install pack same as you would single battery. Plug in phone charger. Fully charge battery pack, and enjoy. You now have a 1S2P 3.7 LiPo battery.
Удачи!
- Александр Борисович Мельников
Actually, paralleling batteries. Does not necessarily require them to be same capacity (if within reasonable range, e.g. 1Ah + 3Ah, is ok, 500mAh + 100Ah, probably not). But requires them be same voltage spec, 4.35V // 4.35V is ok, 4.35V // 4.25V is not good.
Terrance -
My battery hasn't got any b+ pin under the cover. Instead, it has p+ p- and b- pins.
What should i do? Should i connect p- to p- and p+ to p+? Or mine has a different way of doubling procedure?
Most LiPo cells have + and - markings below tabs. Follow instructions i posted, and you should be fine. Your phone will only read one BMS (charging board), so you don’t want two sending mixed information to your phone.
Safe, retro-fitted double battery packs are sold. These safely enable two batteries to be soundly, neatly carried contiguously and, used consecutively by the phone. I'm astounded this dangerous, disreputable, frankly insane method is being demonstrated and recommended here. No. It is inadequate and disingenuous to state this method is being shown for informative/educational purposes. That is like Tucker Carlson saying he only asks questions and, what is wrong with asking questions ... ?
Mrs. Cairns -
Why bother to ask me to provide a unique user name, only to use my actual name for display purposes? Has any other user had this experience on this website?
Mrs. Cairns -
This madness being displayed by iFixit is doubly disturbing. With one page iFixit has drastically reduced its credibility. Thereby allowing any company to use it as an example of why THEIR products really should not be repaired with advice and/or instruction from iFixit. Undoubtedly, there are many, many companies who are privately furious that the game of built in exclusivity/obsolescence, is finally moving into its end stage. They can claim that Oh Yes, they DO believe reducing consumer waste by allowing easier domestic repair and increasing product longevity, is a Great Idea ... But, consumers really ought to wait until THEIR company produces The Correct Models, instead of simply Attempting Dangerous Domestic Repairs/Mods. These companies can then state that naturally, in keeping with the Reduce, Reuse, Recycle ethos, what better way to help ecology in the meantime, than continuing to buy THEIR products which, decreases waiting time for the (secretly putative) release date of The Correct Model/s?
Smh
Mrs. Cairns -
Fellas. This is a very old guide. Very likely obsolete. Modern smartphones have internal batteries very difficult to access, and parts gets ridiculously tinier and tinier. It's very not recommend to practice this guide if you are not a skilled DIYer or electronics guy. Please, be safe.
Thank you for your support for years!
-- The author
Terrance -