3 ms·
Amp hours is particularly annoying IMO because you can't convert it to energy without knowing the voltage.
by Ajedi32 5y ago
Amp hours is particularly annoying IMO because you can't convert it to energy without knowing the voltage.
- imtringued 5y agoThe reason that battery capacity is measured in amp hours is that you can't know the exact voltage of the battery as it drops with lower levels of charge.
- danans 5y agoNewer large-capacity battery systems seem more likely to specify battery capacity in (k)Wh. I think this is because they come with sophisticated battery management systems that keep the battery within a narrow charge (20%-80%) range, so therefore they can be assured of the bounds of the voltage. Also, Li-ion and LiFePO4 batteries have a much different discharge curve than earlier chemistries [1], with much more constant voltage up to 80% discharge. 1. https://www.powertechsystems.eu/wp-content/uploads/sites/6/2018/11/LiFePO4-vs-Lead-Acid-Discharge-Curve-EN.png https://www.powertechsystems.eu/wp-content/uploads/sites/6/2...
- Ajedi32 5y agoIf voltage drops with lower levels of charge, then so does the current (assuming a load with a constant resistance). Isn't that just another reason to use Watt hours instead?