Monday, June 10, 2013

YKS 5000mah 20c lipo batteries my opinion

Well I bought a 5000Mah 20c 2s 7.4 v lipo battery pack from a company in Brooklyn New York .
06/10/13 - 09/01/14 RIP

Minimum Capacity:
 5000mAh
Configuration:
 2S1P / 7.4v / 2Cell
Constant Discharge:
 20C
Peak Discharge (10sec):
 30C
Pack Weight:
 308g
Pack Size:
 145mm x 52mm x 30mm
Balance Plug:
 JST-XH
Discharge Plug:
 NO
Quantity:
1

I had  good experiences with their smaller batteries as can be found in other parts of this blog but I find myself not being able to recommend this pack and many of their other higher capacity packs .

 This particular pack was the best deal as far as I could see but after getting it  I realized it wouldn't fit anything I owned its several mm wider than a shotgun style NIMH pack  and longer than a 6-cell pack but slightly shorter than a 7-cell pack . This made fitment virtually impossible in almost all my models but my ZD Racing 1/10th scale truck and really it was such a tight fit that It makes me uncomfortable . 

The other problem I had was that the power output in my opinion is low even for a 20c rating I found I could only get reasonable performance for around half the pack after the voltage dropped below 4.0 volts it could not provide the amperage needed for my mild brushless system that I was testing it with . The measured usable  capacity was normally around 3000 Mah .

This pack has a Relative Amp 20C x 5A = 100rA 
$12.99 / 100rA = 0.1299cE the lower the number the Cost Effective


Now looking at this graph it should give you a idea of why my battery didn't meet what most people would expect from the ratings  . To clarify if you don't see what this is showing is that the mah rating was determined at a 1C discharge or a 2.2 amp draw but when a 25C load  was introduced the usable capacity dropped off from 2250 ish to 2050 ish .
Its also Important to note that when a manufacturer uses this method that the gap between the  listed capacity and usable capacity gets bigger as the capacity get bigger . This is one of many reasons why most sellers and battery makers don't use the 1C discharge method to determine battery capacity.

The reason I find it hard to recommend (or even buy ) there other higher capacity and C rated batteries is that for the cost you could be buying a battery that is well known in the hobby community for good performance and value with a more appropriate battery rating  .

Other pack capacities available from YKS are:


7.4V 1600MAH 20C
7.4V 1800MAH 20C
2200mah 7.4v 30C
7.4V 3300MAH 30C 
4000mah 7.4V 20C
4000mah 7.4V 30C
7.4v 4500mAh 30C 
5000mAh 7.4V 20C  
7.4v 5800mAh 25C 

11.1V 1500mah 20C
11.1V 1600MAH 20C
1800mAh 20C 11.1v
11.1V 1800mah 40C
3000mah 3S 11.1v 20c
11.1V 3300MAH 30C
4000mah 3S 11.1v 20c
11.1V 5000MAH 20C 3S
11.1V 5000MAH 40C
5800mah 3S 11.1v 25C 
5800mah 3S 11.1v 30C

2650mah 4S 14.8v 30C
14.8V 5800MAH 30C 4S

3300mah 5S 18.5V 30c
5800mah 5S 18.5V 30c

22.2V 2650MAH 30C 6S
3300mah 6S 22.2v 30c
4000mah 6S 22.2v 20c
5000mah 6S 22.2v 25c


Friday, June 7, 2013

Turnigy Pure-Silicone Wire 10AWG (1mtr) RED and BLACK ( USA WAREHOUSE)




Well seems like I always need wire for something so I bought some from Hobby king and all I can say is wow this is some excellent wire for the price the silicone is some of the best I have ever bought and the wire its self  has a nice balance of flexibility from being a fine strand wire but the strands are big enough that strength should not be compromised .
I ended up purchasing 10 gauge wire mostly because it was in stock at the US warehouse and I hope they add more sizes as time goes on because well 10 gauge wire is a bit overkill in most situations.


So if you need some quality wire for cheap , look and see if they have the size you need .












Manufacturer's description :

High quality TURNIGY Silicone wire.
High strand count.
Pure copper & pure silicone.
Temp rating: 200Deg C
Guage: AWG 10#
1 METER 

PRODUCT ID: R10A1780-06 / B10A1780-06



Where to buy :

Turnigy Pure-Silicone Wire 10AWG (1mtr) RED (USA warehouse

Turnigy Pure-Silicone Wire 10AWG (1mtr) BLACK (USA warehouse)

got my second order from hobby king yesterday

Well I have determined that on my order paying 2 dollars more for 2-3 day shipping was worth it in every way but one . First off my package arrived on  June 6 and I placed my order was placed 
Jun 3, 2013 14:19:47 PDT . Compared to my last order this was like getting bumped to the front of the line. My only complaint is that this shipment was not packaged as well .It wasn't terrible but I was not impressed.

Check back as I post about my recent purchases .