ZIPPY Flightmax 8400mAh 4S2P 30C LiFePo4 Pack

 Dale.E 205 points

after reading back a bit I found a few peeps using it for the same setup. Anyone out there in WWW land able to tell me how they stand up after 5 or 6 months? looking at a BMS on fleabay Item number: 221172139610 to match them up and protect them.

 Philip 4 points

I use one in my motorbike and do not use a BMS. I did buy a small battery balancer, but it is not required. After 6 months the cells are 3.31, 3.31, 3.30 and 3.32. They appear well matched. Battery voltage is 14.4V full charge (4x3.6V) and suited to vehicle charging systems. Typical voltage is 13.2V.

 Aleksey 7 points

8AWG = 10 square mm cuprum wires. 103,0? in Russian GOST standard at 12v. Seems 170A at 8.4V so, 20C is maximum. But i think 30C peak it's okay. But i don't know that wires inside the pack. Need to check

 anguyen 3 points

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 anguyen 3 points

www powerstream com /Wire_Size.htm

 DR. RAVINDRA 1 points

the only problem that I'd see is the charging and discharging which happens almost simultaneously in automotive applications.

 beejay 17 points

This pack has no A123 cells. These are packs built like lipo material but are still different, and in 3,6 V per cell like Lifepo4 also has.

 karma 2 points

if your thinking ebike no there is no bms same setup as lipo only you change you charger from lipo to life. you can charge the packs with one charger. i have tested a few lipo monitors on my ebike and find the celllog works best to monitor pack voltage. i don't get false alarms when the pack sages.

 dmitryl 14 points

Hi Karma, Thank you for your reply. Yes, I'm thinking eBike... What charger would you recommend for this pack? What's Adapter Board in order to charge 4 packs simultaneously? What's your opinion about the Turnigy 4x6S Lithium Polymer Battery Pack Charger? It has 4 ports and able to charge up to 4 packs simultaneously... What's CellLog model would you recommend for the pack? Thank you a lot

 karma 2 points

well myself i don't charge them all at once. i cant be bothered to buy or build the leads to do it. the 4 port charger is a good deal there have been a few good reviews on them. i would avoid the cheap ones.i have a cheap one a month old and the start button is foobar already. as for the cell-log the $13 model without logging works well. i use one cell-log per pack. and they can be set to work with lifepo4 for the proper lvc voltage alarm. if you don't discharge the pack below 50% and keep them balanced you should fine.

 dmitryl 14 points

what's the problem with discharging the pack below 50%? I'm a little bit confused with choosing the charger... Does the LiFe charger means the LiFePo4 one? Are the LiFe and LiFePo4 the different names to the same batteries? Does LiFe mean LiFePo4?

 Hannu 6 points

Hello, Are you going to make longer packas that 4S/8400mah? I am looking for large lecrtic boat applications 5S and 6S/8400 Lifepo packs

 flyer88 1946 points

I certainly agree with you.

 technikant 17 points

What are they good for? Low weight starter batteries for Harley's?

 zeeek1 514 points

If your starter needs 252amps to start something? I would say they try them before you knock them.
Of course you would need higher Kv motors to compensate for lower voltage.,

 BAMBAM Cheapsk8 249 points

Good for powering a field charger. If I hadnt just ripped apart most of my a123 flight packs and made them into a 4S2P I would have bought one of these. With that I can charge the two receiver packs and one ignition pack in my 40%.

 Graham Daniel 495 points

If you can properly seal them, OK for larger boats. I'd go nanocell though, better power to weight ratio.

 Neptronix 24 points

These are going to be KILLER for eBikes. Many eBike guys are buying 5000mAh packs right now, wishing we could get 10000mAh or 20000mAh packs. These come close enough!!! Now if we can only get these in 5s/6s, 15 or 20c... for a lower price.. then i can die happy!

 Neptronix 24 points

Whoops - these are LiFePo4.. i was thinking of the lipo packs!! Nonetheless, these are very cool.. might cost more, but much longer life and much safer than lipo!

 John 1 points

David, Another good thing about these is that their already exist proper BMS systems for lifepo4 chemistry. No need to spend $$$$ on lvc hvc and chargers. Although I've read that these cells sag under load a lot, and are actually more like 3c or 4c. I wonder if these need to be primed and treated nice the first dozen cycles. Maybe this could be the reason for the negative reviews.

 Supermac 39 points

HK, please stock these in the US!

 parabellum 7 points

Yes John, they need proper brake in to avoid puffing and so. I wonder, what is the best procedure to do that?

 psupine 1 points

The dimensions on the one that I just received are more like 150x52x75mm, which doesn't help when it was bought to go into a 73mm wide hole.