waste of time. don't bother.

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"At first glance though, these run lower pack voltage under just a 4C load of 22A... They will work but are not as high quality as the Turnigy 20C or Zippy Flightmax 20C... A few days will tell if they will last as a power source for an eBike - they are more expensive and seem initially less capable but... they are (were) available."

I dunno, would you trust that? looks like nobody has given these packs any attention since June.

There are also no ratings on the hobbypartz' site.
Also, nobody else seems to carry those brands. Yet, i see zippy/turnigy even at my local hobby shops.

You can buy Turnigy packs from the USA warehouse and the shipping charges are quite minimal. They are comparable to the Zippy packs. In fact, they may be from the same company anyway.
 
solracotos said:
DeVries

Thanks for the info... Besides this brief report on HobbyPartz Blue LiPo's I found in here: (http://endless-sphere.com/forums/viewtopic.php?f=14&t=18901) do you know of anything else? Same price as equal TUrnigy Lipos on HK but with free shipping :lol:.

Right now,six HobbyPartz Blue Lipos vs six HobbyKing Turnigy. To make a 37v 15ah pack. What is your take.
Click to expand...
Easy take... :wink:

Mike gave the answers in that report you gave the link to...

** edit - I was right in the video, these are nearly 1/3" narrower than the 5S from HobbyKing! I haven't weighed them yet but I compared them to 5S and 6S hobbyking packs, they are just slimmer - guess soon enough we will know if they are 20C and 5000mah capacity.

First impressions - not as high of quality nor C rating discharge as the Hobby King 20C.

Pack doesn't get warm at 4C but... I've used approx 3.6 AH @ 22A (stock controller for testing first) - the battery voltage was sagging down around 54.x volts, somthing I never see so early on a Turnigy Lipo pack...

At first glance though, these run lower pack voltage under just a 4C load of 22A... They will work but are not as high quality as the Turnigy 20C or Zippy Flightmax 20C...
Click to expand...
Are you looking for a 10s configuration? If yes, then that link I provided had these listed on sale at a discount. This is an ongoing sale with new LiPo items going on sale too, so you might see a better deal if those aren't on sale -what you found now.

You gotta go with the HK LiPo, no brainer, imo... :p

:mrgreen:

(HobbyPartz, not!)
 
They were asking $106 for a $42 zippy lipo pack here in town and wouldn't even budge on price. They admitted to buying directly from hobbyking later on too.
 
deVries said:
solracotos said:
DeVries

Mike gave the answers in that report you gave the link to...

** edit - I was right in the video, these are nearly 1/3" narrower than the 5S from HobbyKing! I haven't weighed them yet but I compared them to 5S and 6S hobbyking packs, they are just slimmer - guess soon enough we will know if they are 20C and 5000mah capacity.

First impressions - not as high of quality nor C rating discharge as the Hobby King 20C.

Pack doesn't get warm at 4C but... I've used approx 3.6 AH @ 22A (stock controller for testing first) - the battery voltage was sagging down around 54.x volts, somthing I never see so early on a Turnigy Lipo pack...

At first glance though, these run lower pack voltage under just a 4C load of 22A... They will work but are not as high quality as the Turnigy 20C or Zippy Flightmax 20C...
Click to expand...
Are you looking for a 10s configuration? If yes, then that link I provided had these listed on sale at a discount. This is an ongoing sale with new LiPo items going on sale too, so you might see a better deal if those aren't on sale -what you found now.

You gotta go with the HK LiPo, no brainer, imo... :p

:mrgreen:

(HobbyPartz, not!)
Click to expand...
Click to expand...

I found a some graphs that seem to support what mike observed. http://site.hobbypartz.com/battery/batterytest.htm

For the C rate they seem to have a lower capacity, higher sag and get warmer than their other batteries...

In this one http://www.rcgroups.com/forums/attachment.php?attachmentid=3459136 an user compares HK Turnigy Nano versus HobbyPartz GenAce Lipo.

would be nice to see a comparable Turnigy vs BlueLipo discharge graphs.

Anyways it seems I'll go with the six of those 20c 18.5v 5Ah Turnigy Lipo packs from HK http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15008
 
Thought that I should add an update, first a little background.
Normally I head off into mountain pathways with two 6s 10,000mAh packs (each a pair of Flightmax 6s 5000 25C LiPo batteries) in a backpack - you can see them in the comparison photographs above. Outward bound I use one set of 6s 10,000mAh, when one of the Maxpro battery monitors starts to buzz (<19.8V the leaflet states) I switch packs and return. Then both packs are charged and I balance every 20 or so cycles. I have no Cycle Analyst just a bike speedometer and GPS on my phone for when I get lost!

I have balanced this pack - the cell difference is less than my voltmeter resolution of 0.01V

For testing I go to a nearby mountain path, where my phone's inclinometer gives the steep section of the slope as 15 degrees - this pushes the drive system (Cyclone 500W based) to the limit - I must add my 100W, photos below:

View attachment Climb looking up.jpg
View attachment Climb looking down.jpg

Part way up I heard the battery monitor buzz intermittently, stopped at the top and checked - the monitor's light was blue (>22.2V the leaflet states). Repeated this a few times with the same result and decided to jury rig my voltmeter so that I could see it as events unfolded. Noted that the monitor buzzer starts at 20.5V and when pushing the drive system (slope, high gearing, full throttle) the voltage dropped rapidly, at 18.5V I stopped and then watched it climb back to 23.3V in a few seconds. Rode gently back home and posted this. Comments please.
 
Can you just discharge it on your charger and have it measure the capacity?
 
What LFP said + maybe the batts need to be broken in. Do 4-6 light discharge/charge cycles to see if performance increases. Right now it seems that internal resistance is somewhat high. ARe the packs getting warm?
 
500w cyclone @ 22V - around 800W 37A? Under 2C

It should improve with the first few chargings - maybe enough for that motor.

I don't see it ever reaching "The max rate is 20C , the continue rate 10000mah is 5 -10C ,20000mah is 10 -15C . "

The differing C rate claims is odd - the 2 use very different cells? Or the Yan is confusing A with C ?
 
I'm looking for mushroom clouds up north, I don't see any, so I suspect LFP did not receive his shipment yet, is this correct?? :lol:

Chinaphil,
I don't think your 500w Cyclone is gonna cut it for C rate testing, can you start two cars at the same time for us? :twisted: :lol:
 
How many amps does that kit pull on steep hills? Its got to be more than 500W at max right? 2c would be even worse than the EC Power 4000mah "15c" packs.. at least those ones could do 4c..
 
etard said:
I'm looking for mushroom clouds up north, I don't see any, so I suspect LFP did not receive his shipment yet, is this correct?? :lol:

Chinaphil,
I don't think your 500w Cyclone is gonna cut it for C rate testing, can you start two cars at the same time for us? :twisted: :lol:
Click to expand...


Still waiting for mine to arrive... Damn China shipping... :(
 
As a newbie the combined knowledge of ES is amazing but at the same time frightening when it comes to contributing. So, I just try to write what happens and leave the interpretation to the learned members.

solracotos
"What LFP said + maybe the batts need to be broken in. Do 4-6 light discharge/charge cycles to see if performance increases. Right now it seems that internal resistance is somewhat high. ARe the packs getting warm?"
The battery has been through 3 light cycles - 2,741 3,126 and 5,039mAh to charge. Battery gets slightly warm to the touch.

etard
"I don't think your 500w Cyclone is gonna cut it for C rate testing, can you start two cars at the same time for us?"
Unfortunately in the village where I live car are banned, walking and cycling only. Sometimes I wish I had a car or two.

liveforphysics
"Can you just discharge it on your charger and have it measure the capacity?"
Last night I used the charger to discharge, set at 3.1V termination, stopped at approximately 20V, rechecked this morning and the battery was at 22V, discharged again to 20V and have just started to charge.
 
Charge start:

EC charge start 2.jpg

Charge end:
EC charge end 2.jpg
 
Yes, 15,177mAh
 
Could it be that the initial voltage was 20.3V say 3.4V / cell, even though I set the charger to discharge to 3.1V?
 
With no load present, 3.4v per cell is practically discharged fully. The cells do perk up really fast, so the 3.4v per cell could be a voltage rebound when the charger started to test the SOC at .14 amps.
 
Response from the supplier:

"The discharge capacity is 15000-17000mah, the low rate charge capacity is 20000mah, but the battery quality is very good.
 
Yes, the battery is more than 1 year."
 
I'm treating the battery as a 6s17000mAh 2.5C whilst I await more learned information from liveforphysics.

Phil
 
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