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My ford fusion energy used to have 20 miles after a full charge, after 3 years it is down to 17miles after a full charge. I am assuming 1 or a few cells are not to its optimum charge capacity. Is it possible for me to replace a single or multiple cell? and if so, does the ford c-max energi carry the same type of cell as the ford fusion energi?
 

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Though it is possible to change couple of cells, it's a lot of work and you are playing with high voltage. If you are comfortable working with HV, you should be able to do it.

I doubt that few cells have gone bad.

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Its very possible to replace any of the bad cells/modules.

Make sure the ones you replace are of close or equal capacity and voltage to the existing ones. If not, you'd have performance issues.

Using smart chargers, could speed up the cycle times, your ford fusion would be good to go.


Dxta
 

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It is pretty doubtful that one or two cells are at fault. Likely, you have lost capacity in all the cells, since they're all subject to the same temperature, voltage, current, and (nearly) state of charge.

It's possible that one cell has lost capacity, but it's unlikely.
 
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