We have been advised to only charge the battery between 20 and 80%. I would love to know the science behind this please?
Yes 
that recommendation mainly relates to how lithium batteries age over time.
Keeping the battery mostly between about 20% and 80% can help reduce long-term stress on the battery cells and may help preserve overall battery lifespan and performance over the years.
Charging to 100% occasionally is not usually a problem, but constantly keeping lithium batteries at very high or very low charge levels can gradually increase wear over time.
1 Like
Thanks for your observations. Have there been any tests done on this in the past. I would imagine that it’s the same for vehicles.
Regards
John
Glad I saw this, lately I’ve been leaving my device plugged in for days at a time. It appears that is not a good practice 
This is good and important information. I heard on the video how John answered that it doesn’t matter when the battery is charged, that it’s not like classic batteries, so I didn’t pay attention to it.
But how do I know when the battery is between 20-80 percent?
And one more question, if I put it on to charge when I go to sleep and the AHA charges but then stays on the charger until I wake up, does that harm the battery?
You don’t need to keep the battery precisely between 20% and 80%.
The main thing is to avoid letting the battery stay completely discharged for long periods of time, and to avoid excessive charging habits whenever possible. This is generally good practice for lithium batteries.
Leaving the Aha Halo on the charger overnight occasionally should not be a problem. The battery management system is designed to handle normal charging. The bigger concern would be repeatedly leaving the battery fully depleted for extended periods.
1 Like