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Old 11-07-2012, 06:26 PM   #81 (permalink)
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Those are nimh cells, not lifepo4. I agree its good to have something though.

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Old 11-15-2012, 06:16 PM   #82 (permalink)
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My 8 AMP20 cells arrived today.
They will not fit in a 30cal ammo can, going to have to put them in a 50cal ammo can.
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Old 11-17-2012, 11:06 PM   #83 (permalink)
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Ok soldering didn't work so here is the next best thing.
Got some brass hard ware and curled the corners of the tabs.
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Old 11-20-2012, 10:10 PM   #84 (permalink)
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I'm sure some people want to know how much power these AMP20 cells have when compared to other known batteries.
I rounded up a Snap-on battery tester, some optima batteries, my 20+28 cell 26650 packs and my new AMP20 cell stack.

I tested 4 of my AMP20 cells in serries, temperature was 60'F test voltage was 13.1v and they tested as having:
Canking power equal to 2/3 the cranking power of a new 800CCA optima red top battery.
80% of the rated cranking amps of an optima battery. (new optimas put out about 20% to 25% more CCA than what they are rated for)
The combind out put of 48 size 26650 "2.3Ah" cells configured for "12v" (7 rows 4 cells deep, 7x4 cell battery) charged up to 14.4v @ 75'F.

These 4 AMP20 cells are only half my battery I am building.

Also, I have not charged these cells, I tested them straight out of the box and I do not believe they were fully charged.
I believe full charge for LiFePO4 to be between 14.4 and 14.8 volts.
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Old 11-20-2012, 10:32 PM   #85 (permalink)
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Fully charged cells at rest will only register about 13.4V. During charging their voltage will peak at 14.6V.
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Old 11-20-2012, 11:03 PM   #86 (permalink)
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Right now I'm topping off the stacks of 4 with 14.8v.
During the winter I don't think 14.4v quite fully charges cold LiFePO4 batteries. Using fans, head lights, heater blower further lowers system voltage adding to the low charge problem.
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Old 11-21-2012, 07:15 AM   #87 (permalink)
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I wouldn't really call it a problem. Keeping the cells at a lower SOC will extend their life and you don't need the added capacity of a full cell anyway.
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Old 11-21-2012, 08:04 AM   #88 (permalink)
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At $.41 per Wh and compact size, these loose A123 systems nano cells become competitive with the more ready to drop in GBS packs for use in an EV motorcycle. It will be interesting to see what you guys come up with for heat sinking cases, terminal connectors, and charge balancing modules.
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Old 11-21-2012, 08:11 AM   #89 (permalink)
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A123 cells power density is unmatched unless you go to a LiPo cell as far as I know. This makes them great for motorcycle applications.

From what I've been told by others using these cells, cooling really isn't needed. They just don't heat up all that much. Packaging is the big concern. BMS is well... personal choice.
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Old 11-21-2012, 08:58 AM   #90 (permalink)
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Quote:
Originally Posted by Daox View Post
Packaging is the big concern. BMS is well... personal choice.
These GBS pack systems are plug n play for an EV.
.

Electric Motorsport EV Parts

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