Lithium Polymer Batteries -- How to wire and what to buy.
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- hailrazer
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Lithium Polymer batteries are the newest and currently one of the best choices for batteries in a portable. They are smaller than other batteries, don't develop a "memory" , and last through more charges/discharges than other types of batteries.
But working with Lithium Polymer batteries can be dangerous and precautions must be observed. Be very careful with polarity when hooking up Li-Po's. Also ALWAYS use a protection circuit (PCB) and a Lithium charger that is appropriate for the number of Li-Po's you will be using.
Lithium Polymer batteries come as single 3.7v cells. These cells can be packed together to get 7.4v , 11.1v, 14.8v , etc Li-Po Packs.
When using a 7.4v pack you will want a 7.4v Pcb and a 7.4v charger. Ditto on the rest.
The following diagrams will be based on wiring the 3.7v cells in series to add their voltages together to get the required voltages we need. Batteries wired in series are wired like so :
This is the typical battery most of us use because it has a relatively high capacity for a very small size and cheap price:
http://www.batteryspace.com/polymerli-i ... isted.aspx" onclick="window.open(this.href);return false;
Here is an example on how to wire the different sets of Li-Po packs you might be using :
7.4v pack. (Two 3.7v Li-Po's)
For the Pcb you will need the following :
http://www.batteryspace.com/pcbfor74vli ... limit.aspx" onclick="window.open(this.href);return false;
For the charger you will need the following:
http://www.batteryspace.com/smartcharge ... isted.aspx" onclick="window.open(this.href);return false;
11.1v pack (Three 3.7v Li-Po's) :
For the Pcb you will need the following :
http://www.batteryspace.com/pcbfor111vl ... ocket.aspx" onclick="window.open(this.href);return false;
For the charger you will need the following:
http://www.batteryspace.com/smartcharge ... isted.aspx" onclick="window.open(this.href);return false;
14.8v pack (Four 3.7v Li-Po's) :
For the Pcb you will need the following :
http://www.batteryspace.com/pcbfor148vl ... ocket.aspx" onclick="window.open(this.href);return false;
For the charger you will need the following:
http://www.batteryspace.com/smartcharge ... isted.aspx" onclick="window.open(this.href);return false;
But working with Lithium Polymer batteries can be dangerous and precautions must be observed. Be very careful with polarity when hooking up Li-Po's. Also ALWAYS use a protection circuit (PCB) and a Lithium charger that is appropriate for the number of Li-Po's you will be using.
Lithium Polymer batteries come as single 3.7v cells. These cells can be packed together to get 7.4v , 11.1v, 14.8v , etc Li-Po Packs.
When using a 7.4v pack you will want a 7.4v Pcb and a 7.4v charger. Ditto on the rest.
The following diagrams will be based on wiring the 3.7v cells in series to add their voltages together to get the required voltages we need. Batteries wired in series are wired like so :
This is the typical battery most of us use because it has a relatively high capacity for a very small size and cheap price:
http://www.batteryspace.com/polymerli-i ... isted.aspx" onclick="window.open(this.href);return false;
Here is an example on how to wire the different sets of Li-Po packs you might be using :
7.4v pack. (Two 3.7v Li-Po's)
For the Pcb you will need the following :
http://www.batteryspace.com/pcbfor74vli ... limit.aspx" onclick="window.open(this.href);return false;
For the charger you will need the following:
http://www.batteryspace.com/smartcharge ... isted.aspx" onclick="window.open(this.href);return false;
11.1v pack (Three 3.7v Li-Po's) :
For the Pcb you will need the following :
http://www.batteryspace.com/pcbfor111vl ... ocket.aspx" onclick="window.open(this.href);return false;
For the charger you will need the following:
http://www.batteryspace.com/smartcharge ... isted.aspx" onclick="window.open(this.href);return false;
14.8v pack (Four 3.7v Li-Po's) :
For the Pcb you will need the following :
http://www.batteryspace.com/pcbfor148vl ... ocket.aspx" onclick="window.open(this.href);return false;
For the charger you will need the following:
http://www.batteryspace.com/smartcharge ... isted.aspx" onclick="window.open(this.href);return false;
Last edited by hailrazer on Sat Nov 27, 2010 2:52 pm, edited 6 times in total.
My Portable Systems:
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- limpport
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Re: Lithium Polymer Batteries -- How to wire and what to buy.
Very nice. I've been wondering how to hook up batteries higher than 7.2v. This is extremely helpful!
Re: Lithium Polymer Batteries -- How to wire and what to buy.
Where do you get the charging port for the smart charger to plug into?
- hailrazer
- Portablizer Extraordinaire
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Re: Lithium Polymer Batteries -- How to wire and what to buy.
I make my own with type M jacks from Radio Shack :nobble wrote:Where do you get the charging port for the smart charger to plug into?
http://www.radioshack.com/product/index ... Id=2102491" onclick="window.open(this.href);return false;
http://www.radioshack.com/product/index ... id=prod_cs" onclick="window.open(this.href);return false;
My Portable Systems:
-----Genimini---------Darth64---------Dreamtrooper--------Ncube---------Kamikazi64---N64Boy Advance
-----Genimini---------Darth64---------Dreamtrooper--------Ncube---------Kamikazi64---N64Boy Advance
Re: Lithium Polymer Batteries -- How to wire and what to buy.
Say I wanted to hook up 4 of those 3.7v batteries but still have 7.4 volts total. how would this be accomplished?
EDIT: nvm i think i found out how very cheap.
EDIT: nvm i think i found out how very cheap.
Re: Lithium Polymer Batteries -- How to wire and what to buy.
so, do these pcbs/ smart chargers work with lithium ion cells too?
AfroLH wrote:Yeah well Alcohol adds a little bit of sexyness in my eyes, but I dont drink it all the time.HotDog-Cart wrote: Also, the codename stuff adds a little bit of sexyness, in my eyes.
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- hailrazer
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Re: Lithium Polymer Batteries -- How to wire and what to buy.
Yes.
My Portable Systems:
-----Genimini---------Darth64---------Dreamtrooper--------Ncube---------Kamikazi64---N64Boy Advance
-----Genimini---------Darth64---------Dreamtrooper--------Ncube---------Kamikazi64---N64Boy Advance
Re: Lithium Polymer Batteries -- How to wire and what to buy.
ok good. now i can use this hueg li-ion battery pack i got a the ircuit city closing sale for 2.50$.hailrazer wrote:Yes.
AfroLH wrote:Yeah well Alcohol adds a little bit of sexyness in my eyes, but I dont drink it all the time.HotDog-Cart wrote: Also, the codename stuff adds a little bit of sexyness, in my eyes.
SpongeBuell wrote:As proof, I offer this picture of a monkey on my head.
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Re: Lithium Polymer Batteries -- How to wire and what to buy.
How would you hook up two 7.4v Li-ion packs?
- limpport
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Re: Lithium Polymer Batteries -- How to wire and what to buy.
gamemasterful wrote:How would you hook up two 7.4v Li-ion packs?
The picture on the bottom. Connect them in parallel.
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Re: Lithium Polymer Batteries -- How to wire and what to buy.
I meant to the board. Would I just buy the first pcb listed and skip over the COM? Or is there another I should buy.
- limpport
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Re: Lithium Polymer Batteries -- How to wire and what to buy.
Ah, ok! From his picture for the 7.4v protection circuit, hook up both positives to the B+ part and both negatives to the B- part. The Com (common) won't matter, because that is only for batteries in series.
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Re: Lithium Polymer Batteries -- How to wire and what to buy.
Awesome! So to be clear;
1) Do NOT parallel them and attach the positives to B+, and negatives to B-
or
2) DO parallel them and attach them as you said?
1) Do NOT parallel them and attach the positives to B+, and negatives to B-
or
2) DO parallel them and attach them as you said?
- limpport
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- Joined:Sun Jan 29, 2006 12:32 pm
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Re: Lithium Polymer Batteries -- How to wire and what to buy.
#2. Parallel, and attach positives and negatives to their respective spots.gamemasterful wrote:Awesome! So to be clear;
1) Do NOT parallel them and attach the positives to B+, and negatives to B-
or
2) DO parallel them and attach them as you said?
Re: Lithium Polymer Batteries -- How to wire and what to buy.
These batteries from batteryspace are interresting but shipping it to europe is too expensive... does anyone know where to buy good batteries in europe ?