tegwin
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| posted on 3/5/11 at 09:18 PM |
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Where to get Li-ion batteries
I am building some LED bike lights for use on a 24hour endurance MTB race, they are going to be BRIGHT..
But... I need some fairly chunky Li-Ion batteries, something around 14V with 4Ah would be nice.... I have seen pictures of packs/cells of this spec
with built in management (over/under charge etc)...
Anyone know where such things can be purchased at reasonable price?
Tried the usual suspects, Rs, rapid etc, but no luck...
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Bigheppy
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| posted on 3/5/11 at 09:31 PM |
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Try brchobbies.co.uk they supply the electric model batteries and have many to choose from.
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RichardK
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| posted on 3/5/11 at 09:37 PM |
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Couple of somethinng like this maybe
Ebay Laptop Battery For Asus Eee PC 2G Surf 4G 8G NetBook on eBay (end time 01-Jun-11 08:42:07 BST)
ELAS002W 
noticed a black & decker drill also used them...
Cheers
Rich
Gallery updated 11/01/2011
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tegwin
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| posted on 3/5/11 at 09:39 PM |
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Had considered laptop batteries, but not sure how I would charge them.... Would be a cheap solution though if I could charge them
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Bigheppy
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| posted on 3/5/11 at 09:42 PM |
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brc do the chargers too
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David Jenkins
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| posted on 3/5/11 at 09:44 PM |
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Might be worth a look here.
I bought a new battery for my aged laptop from them - sound piece of kit. They sell all sorts of battery packs, individual cells, and so on.
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Dangle_kt
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| posted on 3/5/11 at 09:58 PM |
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hobby king is amazing
http://www.hobbyking.com/hobbyking/store/index.rc
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BenB
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| posted on 3/5/11 at 09:58 PM |
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I'd be tempted to use a 4S 5000mAh lipo in a hard case. You can get simple chargers for it. You'ld need some kind of cell monitor but BRC
sell a little thingy that plugs into the balancing plug and squeeks like crazy when done.
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graememk
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| posted on 3/5/11 at 10:00 PM |
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i've got about 30/40 laptop batteries that i was going to make a power pack from for an electric bike but never got around to it, yours for the
postage if you want them.
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BenB
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| posted on 3/5/11 at 10:01 PM |
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Perhaps you might be thinking of these?
http://www.electricwingman.com/13v-lead-acid-replacement-battery-4,6ah-clear.aspx
A123 cells have the advantage that you can seriously discharge them without problems. With a LiPo you'll puff them and perhaps even get them to
burn. Which if it's between your legs might not be a good thing.
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tegwin
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| posted on 3/5/11 at 10:15 PM |
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Hmm.. thats prettty big, heavy and expensive! I can get a 14.8v 3ah battery from hongkong for about £50... Still a fair whack mind... Laptop
batteries might well the a good call, IF I can understand how to charge them
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rf900rush
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| posted on 3/5/11 at 10:59 PM |
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LI-PO RC flight packs are cheapish now
I have buought from here a few times
These are 2 cell pack but 2 packs for < £25 is still cheapish.
LINKY
No cell management so.
I built low voltage cutouts warnings into my LED drive PCB.
Blinked the LED lights when they started getting low and off when low.
Martin
[Edited on 3/5/11 by rf900rush]
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Liam
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| posted on 4/5/11 at 01:03 AM |
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Hows about buying yourself a 14.4V li-ion cordless drill. Then you get your batteries, a charger, and something useful to use after this crazy 24
hours of cycling 
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02GF74
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| posted on 4/5/11 at 10:41 AM |
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I have made my own LED lights and run them off 11.1 V Li-on battery.
I use a Mystery blancer charger and all the stuff has survived 2 winters. The LEDs are 5 W emitters and from memory, the battery should power them
for 4 hours - never had them run out as I charged after every run or 2 runs (1.5 hour round trip)
Battery (HOBBYMIX 11.1V 35C 3000mAh LIPO Li-po Akku battery rc ; seller Member ID bulk-verkauf ) and charger (seller cwtco) was sourced on ebay.
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tegwin
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| posted on 4/5/11 at 09:33 PM |
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Agh nice one, there are some quite good value ones from abroad, will put the lights together and then see what size batteries I need to get the light
output I need :-)
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Would the last person who leaves the country please switch off the lights and close the door!
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