li-ion batter pack

3 posts / 0 new
Last post
bizybily
Offline
Last seen: 6 years 1 month ago
Joined: Saturday, January 31, 2009 - 06:01
Points: 30
li-ion batter pack

I found 3.7volt 3000mAh li-ion batteries on ebay for about $2.15 each. If I wired 10 of the 3.7 volt 3000mAh batteries in series I should have a 37 volt 3Ah battery pack. Four of these battery packs wired in parallel will give me 37 volts and 12 Ah. This should power my 36 volt electric bike at a cost of about $85.00. Does this sound right concidering that these battery packs sell for around $500.00?

antiscab
Offline
Last seen: 1 year 5 months ago
Joined: Saturday, July 7, 2007 - 23:55
Points: 1686
Re: li-ion batter pack

those 3Ah 3.7v lithium cobalt cells aren't designed for high discharge.

so you won't get any more than 3A continuous out of them.

Soldering them together is a tad on the tricky side, but not impossible.
just make sure you ones with tabs already included.

you could have a crack at spot welding them, if you have the equipment.
spot welding usually takes 4000A for ~5mS IIRC.

Matt

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah in July 2010. Done 194'000km

bizybily
Offline
Last seen: 6 years 1 month ago
Joined: Saturday, January 31, 2009 - 06:01
Points: 30
Re: li-ion batter pack

thanx antiscab
I thought they must be an inferior cell for the $. Is there any way to build your own pack and save some $$?
The packs they are selling on line are made up of something like a c cell battery but I can't find them individually.

Log in or register to post comments

Buy Ecotric bikes, get free accessories!


Who's online

There are currently 0 users online.

Who's new

  • eric01
  • Norberto
  • sarim
  • Edd
  • OlaOst

Support V is for Voltage