Seeing that many people have the experience of buying fake LFP battery cells.
Here is a real example.
A LiFePO4 battery cell is sold and labeled A brand 3.2V 310Ah, weighs 5.3kg, size is 210mm x 170mm x 70mm. Buyer received and tested only 240Ah.
How to quickly identity its capacity is real or fake before purchasing?
Here is a simple way.
Roughly calculating the energy density according the weight
The production process of LFP battery cells has only fully entered the era of energy density of 160Wh/kg-170Wh/kg from 2020（Only CATL‘s large capacity LFP cell can achieve 170Wh/kg~180Wh/kg).
Although Gotion announced in January 2021 that it had achieved an energy density of 210Wh/kg by using silicon as the negative electrode. However, This type cells are not available in the market so far (August 2021).
You can calculate the capacity to weight ratio.
If the result is greater than 180Wh/kg, please stay away from these cells.
Let’s calculate the energy density of this A brand 3.2V 310Ah cell(weights 5.3kg).
Energy density = (3.2V x 310Ah)/ 5.3kg = 187.16 Wh/kg.
It is significantly higher than 170Wh/kg. It is not achievable with the current process.
It is very likely misrepresented with real capacity.
Actually according buyer’s test result, the actual capacity is 240Ah. The energy density is1 44Wh/kg.
So it’s a 3.2V 240Ah cell and sold as 3.2V 310Ah.
You can also use the volume to aid in identification.
For comparison purposes, we use the EVE 3.2V 280Ah LF280N A-Grade cell as a reference, which weighs 5.3kg and measures 204mm x 173mm x 71.5mm.
So the energy density of EVE LF280N is (3.2V x 280Ah)/5.3kg = 169Wh/kg.
Calculate the volume ratio of the two cells.
Ratio = (210x170x70)/(204x173x71.5) = 0.99
Well, the volume is slightly smaller than the EVE 3.2v 280Ah cell, but the capacity is 10% larger? That’s not very easy to do.
It can also be a reason for you to stay away from deal.
Any question and inquiries please send email to firstname.lastname@example.org, we answer quickly.
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