Voting resources, early voting, and poll worker information - VOTE. ... Adafruit is open and shipping.
0

LithPoly Charger, Parallel batteries
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

LithPoly Charger, Parallel batteries

by mobilewill on Sun Jan 30, 2011 3:59 pm

http://www.adafruit.com/index.php?main_page=product_info&cPath=44&products_id=280

Would it be safe to put 2 batteries in parallel with this charger? Would it but like charing one? I would be using 2 of the Sparkfun 6Ah batteries which is made of up 3 2Ah batteries.

Thanks

mobilewill
 
Posts: 49
Joined: Mon Dec 13, 2010 7:58 pm

Re: LithPoly Charger, Parallel batteries

by dbc on Sun Jan 30, 2011 5:23 pm

Did you check the data sheet? In general LiPo cells need to be managed individually.

dbc
 
Posts: 62
Joined: Thu Jan 06, 2011 7:37 pm
Location: Sunnyvale, CA

Re: LithPoly Charger, Parallel batteries

by mobilewill on Sun Jan 30, 2011 5:25 pm

I know, but the battery is multiple cells but wired in a way that looks like 1 cell. So i figured I could add to that with another set. Wouldn't it be the same as the sparkfun 6Ah set? Seems like when my motors spike or try to go faster the battery shutdowns.

mobilewill
 
Posts: 49
Joined: Mon Dec 13, 2010 7:58 pm

Re: LithPoly Charger, Parallel batteries

by adafruit_support_bill on Sun Jan 30, 2011 5:44 pm

The three cells in the SparkFun 6Ah battery are a matched set. There is no guarantee that the cells from two different sets will be matched.

adafruit_support_bill
 
Posts: 78630
Joined: Sat Feb 07, 2009 10:11 am

Re: LithPoly Charger, Parallel batteries

by mobilewill on Sun Jan 30, 2011 5:50 pm

Thanks, my other option 2 chargers and then connect the outputs of the chargers together. to my project?

mobilewill
 
Posts: 49
Joined: Mon Dec 13, 2010 7:58 pm

Re: LithPoly Charger, Parallel batteries

by adafruit_support_bill on Sun Jan 30, 2011 8:27 pm

For both charging and discharging, you want any cells in parallel to be matched.

adafruit_support_bill
 
Posts: 78630
Joined: Sat Feb 07, 2009 10:11 am

Re: LithPoly Charger, Parallel batteries

by mobilewill on Sun Jan 30, 2011 8:28 pm

If I use 2 separate chargers wouldn't that be fine? as in one separate charger for each battery?

mobilewill
 
Posts: 49
Joined: Mon Dec 13, 2010 7:58 pm

Re: LithPoly Charger, Parallel batteries

by adafruit_support_bill on Sun Jan 30, 2011 8:41 pm

"For both charging and discharging, you want any cells in parallel to be matched."
Charging with two chargers is fine. But if you connect them in parallel to power your project, (i.e. "discharging") you will have problems if the cells are not matched.

adafruit_support_bill
 
Posts: 78630
Joined: Sat Feb 07, 2009 10:11 am

Re: LithPoly Charger, Parallel batteries

by mobilewill on Sun Jan 30, 2011 9:11 pm

That makes sense, thanks

mobilewill
 
Posts: 49
Joined: Mon Dec 13, 2010 7:58 pm

Please be positive and constructive with your questions and comments.