Every multi celled RC LiPo battery will have what is called a balance tap or balance plug. This plug allows individual charging or discharging of each cell in the battery pack. Here are the four main ways to balance a LiPo pack.
http://www.rchelicopterfun.com/rc-lipo-batteries.html
So I will show the common ways to get around these issues. This is the Killer RC LiFe 2-cell 6.6v 3200mAh receiver pack with Hyperion/Polyquest balance plug. As you can see, the battery's polyquest balance plug does not fit into the 2 cell spot on this charger's balance board.
http://www.killerrc.com/forum/viewtopic.php?f=5&t=34
Then just plug in the power plug and start charging. Remember that both the balancing plug and the power plug need to be plugged in during charging. Another way to do it is to use an adapter board, like the one on the left. We sell these in the Killer RC store.
http://www.killerrc.com/forum/viewtopic.php?f=5&t=34
How to repair your LIPO Battery balance leads when they break off the battery. I had many of these in need of repair, I decided to do a video demostrating the repair. Check out rcinformer.com for flight videos, building tips/ techniques. 1  Science & Technology. 2  Standard YouTube License.
http://www.youtube.com/watch?v=G0kBx8moZ94
Notes: When charging below 1.5A (1500mA), it is OK to charge through just the balancer leads, indicated by the Low Amp options in the diagram above. When charging over 1.5A, it is recommended to charge through the main battery leads, and use the balance connector just for balancing. This configuration is indicated by the High Amp options in the diagram above.
http://scriptasylum.com/rc_speed/lipo.html
No. Yes. If each individual cell is rated for 3.7v @ 3000mAh and 20C discharge rate, the configuration above would result in a pack rated for 3.7v @ 3000mAh with a max discharge rate of 60 amps. Similar to above, but this is a diagram to show how your typical prismatic Lipo battery cells are actually wired in a pack. Below the diagram is a section that will show the total ratings of the pack as you change the settings.
http://scriptasylum.com/rc_speed/lipo.html
The power plug, and the balancing plug. Many chargers will not let you charge the battery unless the balance plug is connected. Your charger/balancer might have a different balancing plate than mine does. If your charger is showing an error then the balancing wires probably need to be moved around.
http://www.killerrc.com/forum/viewtopic.php?f=5&t=34
In the end, it is personal preference and more dependent on what type of plug your ESC or your LiPo's come with. Many RC LiPo batteries and ESC's actually don’t come with any plug type (just the two wire ends insulated with heat shrink).
http://www.rchelicopterfun.com/rc-lipo-batteries.html
Wow, this RC LiPo battery basics was a BIG topic and I think the longest write-up page on my whole web site! Hopefully you have a better understanding of what makes a RC LiPo battery tick, how to properly care for one, and a few recommendations.
http://www.rchelicopterfun.com/rc-lipo-batteries.html
LiPo Hybrids. All RC LiPo batteries out there at the time of this write up (March 2014) are actually a hybrid lithium polymer battery. The correct name for this type of battery is lithium-ion polymer, but the battery world of today simply calls them lithium polymer even though they are not a true dry type LiPo battery.
http://www.rchelicopterfun.com/rc-lipo-batteries.html
what is the balancing plug on rc batteries for.
The balancing plug on RC batteries allows individual charging or discharging of each cell in the battery pack. The balancing plug on Radio Control batteries allows individual charging or discharging of each cell in the battery pack.