I have purchased six each 1S 138 that were sorry but not puffed a couple of years ago. One 3S nano tech 45C 2.2 Ah which was not great but better than I expected. A total of 7 each. nano tech 25C 2S 180 , 4 around a month ago and 3 arrived today. Two of todays's arrivials look and check fine voltage wise and one puffed big time one cell.

Normal thickness is 0.405" and the puffed one is 0.500" . Good ones all cells 3.87XX and puffed one 3.766 and 3.825 so well within their ( Hobby King's) good range.

Not going to freat over it as it was a $5 Lipoly and 6 out of 7 good ones to date is better than I really expected.

I have 3 more on order but they were only $3.50 ea. including shipping thanks to a buddy code.


Charles

Charged @ 200 mA (0.2A) / Discharged at 540 mA (3C) until first cellreached 3.6V
and cell inbalance was not very pretty .

Charged again @ 200 mA rate and discharged at 1A down to first cell to reach 3.3V and capacity delivered was 99.2 mAh .

Charged again at 200 mA and did a 2A discharge down to first cell to reach 3.3 and 91.8 mAh delivered.

Good one tested here

http://www.rcgroups.com/forums/showthread.php?t=1584967

I have never had a problem with a battery from HK. Looking forward to that graph!

can share that buddy code mate?

It has expired. Buddy codes are kind of tricky. You have to have an account, be loged in and then click on the buddy code which is a link to the item. The buddy code for these LiPolys is only good for 1 to 3 ea. of them and the code is only good for 14 days after it is issued.
Charles

Charles, are the IR's pretty equal on all packs? My guess is yes but I find that some need hard balancing when charged fast.
I remember when I dismantled a FB's pack, a 3S 2200 pack that had mah stickers ranging from 2140-2160 to 2260-2280? His non-balancing charger 'bout cooked the low mah cell over time.

Rick

Rick form post #10 of the other nano 180 test thread

cell IR notes for those who follow such.
Charge #2 @ 1C 62.1 and 61.1 @ 72F.
Charge # 13 now at 3C charge rate 62.7 / 62.4 @ 73F.

Checked this morning 87.9 / 82.2 This one has 51 bench / test cycles and 5 flights

-------------------------------------------------------------------

This puffer 2nd. charge at 200 ma cells 84.0 / 55.5
checked a couple of l times 105 / 73.5
125 / 68.4


Charles

Originally Posted by everydayflyer

Charged @ 200 mA (0.2A) / Discharged at 540 mA (3C) until first cellreached 3.6V
and cell inbalance was not very pretty .

Charged again @ 200 mA rate and discharged at 1A down to first cell to reach 3.3V and capacity delivered was 99.2 mAh .

Charged again at 200 mA and did a 2A discharge down to first cell to reach 3.3 and 91.8 mAh delivered.

Good one tested here

http://www.rcgroups.com/forums/showthread.php?t=1584967

What was the resting Volts on the 1A and 2A discharge cycles?
thanks

From post #2

Charged again at 200 mA and did a 2A discharge down to first cell to reach 3.3 and 91.8 mAh delivered.

After that discharge and setting overnight cells were 3.729 and 3.825.

No point in doing detailes tests or notes on a bad Lipoly. I will save it for now and if one of the other three I have coming has a puffed / bad cell I will cobble the good cells together.

I'm going by how long you have been a member on this forum and guessing you might of been buying battieries from Hobbyking for quite some time. there again i could be wrong,everydayflyer that is

It's the law of averages you might get a bad battery once in a while from any battery supplier/maker,i've been buying my batts from hobbyking for a good few years now and i've never had a bad one yet ( you just know i'll get one now) and i hope it carries on like that.

I rarely purchase LiPolys from Hobby King as I have seen to many negative reports and the few I have purchased have been sub par. The 25C 2S 180s are the exception it seems as ones I received and tested at the thread I linked to were very good and many down in the RTF Micro thread use them with good results.

As to getting a bad one from other vendors I never have and if I did it would not be a hassle to get it replaced.

Charles

Originally Posted by everydayflyer

From post #2




After that discharge and setting overnight cells were 3.729 and 3.825.

Thanks

Originally Posted by everydayflyer

I rarely purchase LiPolys from Hobby King as I have seen to many negative reports and the few I have purchased have been sub par. Charles

How can you possibly say that when everybody here knows that Hobby King batteries are the best quality batteries you can get?

Originally Posted by Skyshark01

How can you possibly say that when everybody here knows that Hobby King batteries are the best quality batteries you can get?

And besides - they're cheap... if they puff, just buy more!

cheap is correct and buy more would be very necessary if you fly as much as I do. To date it would take numerios . HK LiPolys to last as long as one Thunder Power does and even then the HK's performance would be sub standard.

I say again as I have many times in the past. Purchase price is not what I look at it is cost per flight.

I have numerious Thunder Powers and Hyperions with over 300 flights on them and have yet had a HK to make it to 100 and most lasted less than 50.

Charles