LiFePO4 batteries in the 12 volt "gel cell" format

Batteries, Chargers, and Battery Management Systems.
etriker   100 kW

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Re: LiFePO4 batteries in the 12 volt "gel cell" format

Post by etriker » Jul 02 2013 12:26pm

I am testing 2 of these. Using balance wires and a balance charger to charge.

I like them a lot and the price is right. Maybe the best cheaper battery out there.

http://www.batteryspace.com/LiFePO4-Pri ... t-PCM.aspx

Hillhater   100 GW

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Re: LiFePO4 batteries in the 12 volt "gel cell" format

Post by Hillhater » Jul 02 2013 9:12pm

There are also the "Ballistic" packs..
This 12v(13.6v) , 4 cell, 8ahr, weighs 385 gms, and can crank 135 A burst.
It is on Amazon for $63.
They have higher capacities also (up to 28Ahr)
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This forum owes its existence to Justin of ebikes.ca

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7tronics   10 mW

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Re: LiFePO4 batteries in the 12 volt "gel cell" format

Post by 7tronics » Aug 08 2013 1:43pm

OK, an update:

Clean Republic CR1210 bamboo encased "12v 10ah" measure out to 9.5AH at C/5 discharge rate on GT Power A8 (WMR CBA IV on order). After 5 charge/discharge cycles on two different ebikes (Giant LaFree and Currie eFolder with 300w motor) still measure at about 9.5AH capacity. They are being used as "24v 10ah" series connected in an old Currie cloth pack which has a fuse and disconnect switch. I added a cable with dual schottky so that two sets can be used in parallel. As they are still under warranty I haven't opened one up yet. Will do so as soon as warranty expires next year.

See more on the CR1210 here:
http://endless-sphere.com/forums/viewto ... 14&t=50756

I have adhered to the "don't mix battery chemistry" warnings. What is the danger of connecting two schottky diode isolated packs, one LiFePO4 and one set AGM ("gel cell") to a 24v motor controller?

I would think that initially the LFP pack would provide current until the voltage dropped within range of the AGM pack. Then the two would load balance and provide current proportional to the internal battery impedance. Is there a side effect I'm neglecting and should understand as long as schottky isolation is in place?
Mark Smith, @W4CHL W4CHL Wiki
Light Electric Vehicle Assn
eBikes: 2001 Currie eFolder, 2001 Currie Mtn, 2005 Giant LaFree Lite, 2008 & 2010 Currie Trailz, 2010 iZip Via Rapido, 2011 Powabyke Shopper, 2008 Optibike R400, 2010 Marin Bikes BionX MTB
Other LEVs: 2007 Currie Tech eZip 500 eScooter, 2013 OT ELF (4Q2013), 2017 Osdrich A10 Hoverboard

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7tronics   10 mW

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Re: LiFePO4 batteries in the 12 volt "gel cell" format

Post by 7tronics » Aug 08 2013 1:52pm

etriker wrote:I am testing 2 of these. Using balance wires and a balance charger to charge.

I like them a lot and the price is right. Maybe the best cheaper battery out there.

http://www.batteryspace.com/LiFePO4-Pri ... t-PCM.aspx
As soon as the integrated BMS version of above listed here:
http://www.batteryspace.com/LiFePO4-Pri ... ncing.aspx

has a significantly lower premium for the integrated BMS I'm there! $55 per 12v "AGM brick" for the BMS is a bit too high. Nice as it is with visible LEDs etc.

What balancing charger are you using? How did you bring out the connections and what connector are you using to an external BMS/charger?
Mark Smith, @W4CHL W4CHL Wiki
Light Electric Vehicle Assn
eBikes: 2001 Currie eFolder, 2001 Currie Mtn, 2005 Giant LaFree Lite, 2008 & 2010 Currie Trailz, 2010 iZip Via Rapido, 2011 Powabyke Shopper, 2008 Optibike R400, 2010 Marin Bikes BionX MTB
Other LEVs: 2007 Currie Tech eZip 500 eScooter, 2013 OT ELF (4Q2013), 2017 Osdrich A10 Hoverboard

dnmun   100 GW

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Re: LiFePO4 batteries in the 12 volt "gel cell" format

Post by dnmun » Aug 08 2013 1:58pm

tommy l has just offered a 20% discount on his 12 V lifepo4 AGM format batteries to members of the sphere who contact him directly.

http://www.endless-sphere.com/forums/vi ... 31&t=40426

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