Post by BroJames on Apr 5, 2008 0:35:11 GMT -5
Yuntong, manufacturer of the Bremen Haus LiPoly Batteries and an ISO9001 certified battery manufacturer, now label their batteries in accordance with European standards. Discharge Rate ("C") & MilliAmpere Hour capacity ("mAh") are now stated conservatively as they are expected to remain at the end of the European 1 year mandatory warranty instead of time of manufacture. For example 13C LiPolies are now labelled 10C.
11.1v 900mAh Square Stick or Tootsie Roll (Comparable to 1200mAh).
11.1v 900mAh Chicklet or Chaku (Pic not shown)
11.1v 2000mAh Mini-type LiPoly n(Comparable to 2200mAh).
11.1v 2300mAh Big Chaku or Big Chicklet Type LiPoly (Comparable to 2800-3000mah). Capable of more than 22 magazines using 420fps Jing Gong AEG.
7.4v 5000mAh(6000mah? Actual Specs at time of manufacture still unknown). The battery is wrapped in hard plastic casing and fired more than 66 magazines using 420fps Jing Gong AEG. Actual Size is almost the same as an 8.4v Sub-C.
From Left, a YANLL 11.1v 1550mAh (Comparable to 1650mAh), Vislero 11.1v 2200mAh 15C (Comparable to 2500mAh 23C) and, Yuntong 7.4v 5000mAh.
Normally, the Burst Discharge Rate of a LiPoly (also called Maximum C) is twice that of its Sustained or Continous discharge rate (sometimes called Minimum C). Its Rated Discharge Rate is the average of the 2 and is sometimes refered to as Average C. A LiPoly with 10C Sustained C at the time of manufacture will have a 20C Burst C and 15C Average C.
If a country require battery distributors or manufacturers to guarantee the specs of the batteries they sell for at least 1 year, and if the discharge rate drops by 10% to 8C after a year (for example), distributors or manuifacturers will label their battery 8C instead of 10C otherwise they will go bankrupt from warranty claims.
Standards vary from country to country which is why a San** battery sold as 2800mah in countries like the Philippines will be sold in other more advanced countries only as 2100mAh. However, in the absence of strict government regulations, San** uses a more liberal method of caculating mAh which means that the maximum and minimum voltage they used in their calculation is wider resulting in a higher mAh.
But some manufacturers simply stated any figure between the minimum and average mAh. Later, the true mAh and "C" at time of manufacture was used. But lately, the expected mAh and "C" at the end of the warranty period is used especially among manufacturers of batteries for r/c. This printing of conservative specs serves 2 purpose. Firstly, it ensures that warranty claims from batteries that fall below the printed specs will be few. Second, it makes their conservative batteries perform better than competitors' batteries with true specs.
But while major manufacturers are starting to practice conservative labelling of battery specs, some small and backyard style manufacturer still overlabel their batteries.