Electric Bikes - eBay LiFePO4 seller dy-power, so far so good

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misslexi
09-23-08, 04:32 PM
I bought a 36V 20AH pack from seller dy-power, includes BMS. So far so good, it measure out fine, meets AH spec at a 0.5A rate (that's all the power resistors I have), and charges fine. It's your basic duct tape pack for <$30/AH.

Received it within 8-10 days, well packaged.

Very fast response to all questions.

Anyway, just an FYI in case anyone is shopping.

alfonsopilato
09-24-08, 04:06 AM
How much did it cost?
misslexi
09-24-08, 09:43 AM
Sorry, I should have thought about posting a link in the first place. Here it is.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170258487821&ssPageName=ADME:X:RTQ:US:1123

At $578 delivered, that's $28.90/AH which was the best I could find at the time I was looking. You also have to consider they do NOT include a charger. I bought one from ping for $52 delivered so my total cost per AH is $31.50. That's still a good price per AH I think.

Using Dewalt 36V batteries for example, which I would dearly love to, are closer to $100/AH.

I realize that AH only tells part of the story, and it is an important consideration. The continuous discharge rate is also important, particularly for high power applications. The pack I bought from dy-power is 1.5C or 30A continuous discharge which is over 1KW. Since I'm using a 600W motor and a 30A controller, the pack will meet my needs.

bdcain
09-24-08, 11:27 AM
what does it weigh?
misslexi
09-24-08, 03:10 PM
Fresh from the digital bathroom scale: 15.0 lbs.

And...

It has independent discharge and charge wires, 4 total. Both + (red) wires go directly into the pack, both - (black) wires go into the BMS. Charge wires look to be around 18 gauge, discharge looks to be about 12 gauge.

Seller states the BMS protects from both over charge and over discharge.
cheesepuff12
09-24-08, 09:40 PM
i have a ping ping battery of this type. cant wait to put it on my battery.
misslexi
09-25-08, 09:23 AM
Update: I noticed today the seller is offering a different battery with the BMS built into the charger instead of the pack. And including a 2A charger as part of the deal.

I'm not sure how moving the BMS to charger will affect protection from over discharge; maybe they split the BMS into two circuits??

They also seem to be offering even higher AH packs.

Guess I bought version 1.0 huh? :p