Factor 3: Battery health The final factor would be current battery health. This is based on the math between both the design capacity and the actual capacity of the cell. For iP- hones, this is easy to determine because they use a measurement that is constantly doing learning cy- cles. Therefore, iPhones create averages that turn out to be this “battery health”. So to Illustrate this, if the batteries original capacity was 1000mah and the actual capacity was 765mah. Just plug that into an easy equation where D is design capacity and A is actual capacity. Formula: A / (D / 100) where 100 is the total percentage out of 100 of battery capacity. Plug in our numbers: 765 / ( 1000 / 100 ) Order of Operations: 765 / 10 Final percentage based on reported numbers: 76.5% Therefore, we can see that we are at about 77%, if we do the same rounding as the device does. So with all this info, we can look at the examples below and determine which ones are good. While there are more ways to continue to evaluate this informa- tion instinctually, we should be able to determine overall health with these three factors.
Battery statistics examples
M = Months C = Cycles BH = Battery Health
Let’s say, all batteries are 3000mah and 80%BH is the replacement time. 80% of 3000mah is 2400mah. 1. 8M 120C 97%BH = Good Battery 㨆 We can see here that we have a low cell age and low cycles. Also, the battery health matches those numbers. I would call this a good battery in a used phone. 2. 28M 50C 100%BH = Bad battery 㨏 Right off the bat, we hope you can see something here is fishy! How can we have 100% battery health with a 28 month cell age and 50 cycles. Easy, the battery was not used long enough to drop its first percentage point. It was sold and put into storage. This means that if the phone is used now, the bat- tery will start to perform those averages. It may start to show degraded health very prematurely once the averages reflect into BH. 3. 16M 1000C 70% BH = Bad battery 㨏 This reflects classic battery degradation and shows through all factors a bad battery as battery statis- tics intended and showed. With 16 months the bat- tery is nearing its expiry date, with 1000 cycles it is clearly a heavily used battery as well during those 16 months. Lastly the battery health has depleted a lot too. All in all a generally bad battery that would need replacing. So, now we hope you can see the relationship of battery statistics and used devices. Not all used devices have the same quality battery. Therefore we cherry pick our used devices not only based on cosmetics, like all other sellers. We evaluate every unit for proper battery statistics to make sure you are buying the quality you know 2Service stands for. Battery health alone does not tell you enough to make sure of this.
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