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