Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Electric Bikes Here's a place to discuss ebikes, from home grown to high-tech.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-25-14, 03:47 PM   #1
mrdc
Junior Member
Thread Starter
 
Join Date: Aug 2009
Bikes:
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
li po battery and lead acid can you link them?

can you link them in parallel for added distance/time on the road?
thanks
mrdc is offline   Reply With Quote
Old 02-26-14, 11:56 AM   #2
7up
Senior Member
 
7up's Avatar
 
Join Date: Jan 2014
Location: Whitestone,Queens/Bayonne N.J.
Bikes: Schwinn*2x Stingrays,2x Fastbacks,Speedster Custom 5spd,RollinRock Cruiser*Ross Apollo 5sp*Panasonic DXSport*Peugeot U08,2x PX10*Specialized XCFSM4*Bianchi Milano igh,Pista SS,ViaNarone7,Oltre XR1*Origin8Crawlr*Trek XCalibr8*
Posts: 159
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
I read that that's a no no.You could use one and then switch to the other battery pack.Some guys carry the spare pack in a backpack.
7up is offline   Reply With Quote
Old 03-05-14, 10:45 AM   #3
Ypedal 
Senior Member
 
Ypedal's Avatar
 
Join Date: Oct 2008
Location: Moncton, NB, Canada
Bikes:
Posts: 113
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
RC type LIPO is typically 4.20v~3.0v per cell charged/drained ..

Lifepo4 cells are 3.65v~2.0v per cell ......

Lead acid 12v bricks ( 6x 2v cells in one brick ) generally sit at 12.8v charged and no load...

In order to parallel batteries, you need to combine the proper number of cells so that they operate in the same range.

so. 4x lifepo4 cells in series = 3.65v x 4 = 14.6v .... and once off the charger and put under light load, most of them drop to 3.3~3.2v range x4 = 13.2v ~ 12.8v .. .fairly close voltage range to run with SLA in parallel.

Lipo on the other hand.. 3 cells x 4.2v = 12.6v .. hook that up to a 12v SLA and the SLA will over-volt the lipo = BOOM

4 cell lipo x 4.2v = 16.8v .. with a 12v SLA .. will cause a serious over-volting of the SLA brick .. again = BOOM..

so. bottom line.. if you need more range, and already have an SLA pack... get any Lithium pack you want that can deliver the power you need.. and run A pack.. then the B pack.. do not parallel them....
Ypedal is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 11:35 PM.