How to store/ conserve unused Li-ion/ Li-po batteries?

Have several unused Li-ion and Li-po cells: My laptop battery, only used when working outdoors (is in summer). Half broken MP3 players, phones, a broken RC helicopter and some larger batteries.  Some might be useful one day in a future project. As I understand these cells slowly deteriorate even when not in use.  What is the best way to keep them in shape? Perhaps dry storage in a freezer? Charge them occasionally or have them uncharged?  Are button cells Li-ion cells?

Question by BobS   |  last reply

Need help re-proposing 18650 cells into a E-bike battery Answered

So I was lucky enough to snag 35+ Temperature recorders from work today, Each with a 18650  cell (or two) inside. I've already made sure there wasn't a Deposit or return credit on them first so no problem there :) And I already know how to test each cell to see if they hold a charge. Does anyone have some suggestions about how to wire them all together? I was looking at This Movie Earlier and seems they used 30X 18650 cells to build a 37V battery pack My biggest concern is balancing the cells. since 3 are wired in parallel (then 10 groups in series) it seems to me that each cell may receive a slightly different charge. I'm trying to find a 9-cell balancing charger but no luck quite yet. Even if I do, does anyone think that will cause an imbalance in each of the three cells wired in parallel? Also each cell has some sort of an over discharge regulator on it as well. I'm wondering if they would be a factor in charging/Discharging the cells. (First time I've used this many 18650's in one project in a parallel/series circuit ) Any thoughts would be appreciated; I'll be sure to give a Best Answer ;) Hope to hear back soon! Wired_Mist

Question by Wired_Mist   |  last reply

iPod Touch Battery Thickness (need thin battery)

Does anyone know the thickness of the 4th gen ipod touch battery?  I'm looking for a thin lithium battery (less than 2mm thick) that has decent capacity (more than 300mAH).  If anyone knows the thickness of the ipod battery (or any other suitable battery) it would be greatly appreciated.

Topic by guyfrom7up 

What powersupply or charger should I use?

It is for a battery pack for a cordless drill made of good sony high drain cells from "died" makita packs. It is for another drill then makita. I found this bms: Should I use an Imax charger, or a regular notebook charger, about 19-21 volts?;=item43cbb93aaf

Question by rnijland   |  last reply

Charge 4 Lithium Ion Batteries in series?

I have got 4 3.7v 6000mAh lithium ion batteries connected in series with 2 batteries holders. I would like to charge them without taking them out (prefer to seal a unit). Anyone know how to do this (I could connect the 4 "cells" individually to separate input/outputs.)? Also have 19v 3.16A power supply available to use also for charging (Batteries are for making it portable and plug for the 19v) Have this ordered if it is useful: 4-Cell Li-ion Li-Po Lithium Battery 18650 Charger Protection Board Help appreciated

Question by bonze77   |  last reply

Need help about making an enclosure design of a Bluetooth speaker?

I want to make a Bluetooth speaker using the components shown in the picture. I can't really think about a good looking enclosed about it. So some design from you guys should help. 1. Building material still not chosen. 2. There have to be 2 passive radiators on front and back. I'll probably using a single 18650 cell or a li-po battery , so needed some internal space to Mount everything. I have a design similar to bose soundlink mini 2 but it's too low profile and well engineered ;-; Need help

Question by Sayan_trex 

Splicing A Wii Power Adapter to work with a Battery Pack?

Hey guys, I'm planning to build a Wii portable laptop (, and I have all my parts except for my battery. I need something rechargable, so after a couple minutes of searching, I came up with two solutions! This Li-Ion battery = ​ or This Li-Po = I am a beginner at wiring, and quite honestly, all I know how to do is soldering (in theory, I haven't tried it yet). How can I splice my wii power brick to fit either of these battery packs? Thanks a ton for helping me with my (noobie) question!

Question by Gizmo770   |  last reply

using a lipo charger to charge a SLA? Answered

Hey everyone ! I'm planning to use a lipo charger from my Ebike to charge some scooter SLA batteries. I'm more of a li-po guy and haven't tried charging 3 SLA's in series before. Original lipo was a 10s 8.8Ah 36V (nominal, maxed out at 42V) and had an on board BMS that took a stright 42V input from the charger. the charger for it will deviver 42V @ 2amp and will let current flow until it hits 42V then automatically shuts off. The scooter batteries are 3X 12V 20ah  (six cell I assume?) by all-means, I should be able to wire the three batteries in series, (3 x 14.5V = 43.5V) then my charger should be a direct replacement right? Still need to manually balance them occasionally but for daily use on a 2amp charge should be ok eh?

Question by Wired_Mist   |  last reply

Questions on building a lithium battery pack with pcb?

I have to build a pack to run my portable N64.  I have some experience building with NiMh and NiCad, but I havent built a li-ion yet. Ive done my research but would like some feedback before I start building. Parts 18650's - 3.7V  3600mAh ea 7.4V PCM for 18650 Li-Ion/ LiPo 7.4V Li-ion/LiPo charger at 1.2 Ah Plan Either to build a 2S2P pack or a 2S4P pack.  Currently the N64, 7" TFT LCD, Controller, and Audio amp w/ 2x 8Ohm speakers is consuming just over 1A from what i can tell.  its running off of a perfboard w/ regulator and rail, thats hooked up to a universal transformer that is set to 7.5V  1A.  Everything works but when I turn the volume up it cuts off and then powers back on.  I dont know any other way to find out the over all power consumption.  I cant just look up all the specs because the LCD is from china and i dont have any specs. Anyway, back to my plan.  obviousely I want as much run time as i can get out of it with out compromising weight and space.  all componants of the portable can run off of 7.4V or lower, to include the lcd even though its rated at 12V. it can run as loas 6.5V. I have been debating between the 2S2P which should yeild 7.4V 7.2 Ah, and give me a runtime, some where in the ball park of 4 hours. or a 2S4P which should yield 7.4V 14.4 Ah. It would only be slightly more space and provide approximately 8 Hours+ Thats if I am even calculating everything right Ok, Regardless of whether i run a 2S2P or 2S4P the connections to the Protection Circuit will be the same, Right? Pos --> B+ Neg --> B- + to - ( Between Series connection) --> B1 or BM I understand that Li-Ion are safer when it comes to balancing then LiPo, but is this right?  having 2 parallel cells or 4 parallel cells connected with the only balance connection between the series.  I just want it to be safe. Next  is the charging.  I bought a cheap smart charger for 7.4V 1.2A output.  Will it matter whether i build the 2S2P or 2S4P, or will it work for both.  I know it will obviousely take twice as much time to charge with the bigger pack, but is their a max number of individual cells that a PCB can handle, or does it only matter the overall voltage? I also Included in my diagrahm a setup for a DPDT switch to change between pack powered, wall powered and battery charging.  I want it to have an "ON" and "OFF" setting. while off, pack is disconnected and if wall charger is plugged in, it will charge the pack.  while in the "ON" position, pack will power the device, but if wall charger is plugged in, then it will run off that. Can I even use a wall charger for the Li-Ion pack to power the device, or will it not work.??

Question by supramp