State of health of lithium batteries (SOH): many problems and some solutions

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The state of health (SOH for "State of Health") of the lithium battery that powers any electrical device is a legitimate concern, because it has the defect of degrading, a little over time, but above all with the use we make of it, and thus lose storage capacity and power. Its knowledge even becomes crucial when it comes to an electric vehicle since its autonomy and its price in the event of resale are at stake.

However, car manufacturers have so far been reluctant to easily provide this information to their customers. It is necessary to deepen the subject, much more complex than it seems, to understand why and to know if we can really know the state of health of a lithium battery, and if so under what conditions.

Twiz O'Meter, the screen that says a lot about your Twizy

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Twiz O'Meter, the screen that says a lot about your Twizy
By simply plugging it into your Twizy's OBD socket, Twiz O'Meter is a touch screen that provides a wealth of information that happily complements that of the very brief original dashboard. Via a simple and intuitive interface, you can for example consult the precise remaining charge or the state of health of your batteries. Its gyroscope and Wi-Fi connection bring additional dimensions. It succeeds advantageously to Twizplay which had the same objective but was less complete and much more expensive, and which is no longer available.