![]() The capacity of a battery is measured using a C Rating. It is certainly a case of properly comparing apples for apples (or in some cases, apples for lemons). The method for rating a batteries capacity is not regulated in Australia, so while it may appear that you are getting an extra 20ah out of this battery, this isn't actually the case when comparing the same discharge rates. Our batteries are often compared to another, cheaper lithium battery on the market, which is 120ah purely based on cost - there are many cheaper batteries hitting the market. Discharge rates faster than the rated capacity creates additional heat internally and will see a lower total output. Batteries have losses during charging and discharging. With that same battery rating, if you discharge it faster, you will get a lower total amp hour output or if discharged slower you will get a slightly higher amp hour output. The rated capacity of a battery is based on a pre-determined capacity at a set discharge rate and set temperature (usually 25 deg C) to provide the full capacity of the battery. If you want a quality battery made with cells manufactured using the very best raw materials and BMS components available on the global market, and you want reliability and longevity (think 10+ years), then it pays to buy quality which costs a little more. ![]() ![]() Similar issues are seen across the industry with cheap solar panels too. Either they or the manufacturer are providing misleading information as to what is inside their batteries. You can ask retailers which cells they are using, but often they either do not know, or have bought an off the shelf product and put their sticker on it. All it takes is for one 18650 cell to fail and it's a rapid decline of the rest of the pack. They cannot produce the higher current output of a good quality prismatic cell pack like used in our AllSpark range. Evidence shows the BMS can even catch on fire in these cheap batteries as they have no safety mechanisms and are made with very cheap components. Pictures of these when opened show battery cases that are 50% empty space with a BMS that can only handle about 30A max output. We even seen some very cheap "100ah" batteries that when capacity tested, don't even provide 50ah. Many cheap batteries don't provide anywhere near the claimed capacity, have very low grade BMS and are sold my nameless online sellers with useless warranties. They are slightly larger than AA batteries, with hundreds of them strapped together to make up a cheap and very unreliable battery pack. ![]() To achieve lower prices they are most likely using low grade cylindrical cells. Generally speaking, lower priced batteries on the market use lower priced or very low duty materials. ![]()
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