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Headphoneus Supremus
No company in their right mind will have a charging circuit that overcharges a lithium battery (over 4.2V per cel). It's a recipe for disaster.
Regarding keeping the device near full charge (4.10V or above per cel) for an extended period of time it's been documented that this is very stressful for lithium batteries, and can be more detrimental to the overall lifespan than multiple charge cycles. Most of the battery issues that I've read for the Mojo are from people leaving the device plugged in 24/7 for extended periods of time. I'm not talking about detrimental effects of short charge cycles or topping up the battery which has no effect on lithium battery lifespans. It's remaining above 4.10V for extended periods, like constantly flexing your muscles (as Battery University puts it). You're going to wear out if you do that. The three most stressful states for lithium batteries are, too hot, drained fully, and kept at a high voltage for too long.
From Battery University:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
For the Hugo2 Rob implemented a smart charging scheme that doesn't top up past 4.05V per cel when left plugged in and there's the new desktop mode as well which bypasses the battery if left plugged in for more than 24 hours. Obviously they recognize the importance of not keeping the battery too 'full' and 'topped up' when used in a desktop environment.
Regarding keeping the device near full charge (4.10V or above per cel) for an extended period of time it's been documented that this is very stressful for lithium batteries, and can be more detrimental to the overall lifespan than multiple charge cycles. Most of the battery issues that I've read for the Mojo are from people leaving the device plugged in 24/7 for extended periods of time. I'm not talking about detrimental effects of short charge cycles or topping up the battery which has no effect on lithium battery lifespans. It's remaining above 4.10V for extended periods, like constantly flexing your muscles (as Battery University puts it). You're going to wear out if you do that. The three most stressful states for lithium batteries are, too hot, drained fully, and kept at a high voltage for too long.
From Battery University:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Lithium-ion suffers from stress when exposed to heat, so does keeping a cell at a high charge voltage. A battery dwelling above 30°C (86°F) is considered elevated temperature and for most Li-ion a voltage above 4.10V/cell is deemed as high voltage. Exposing the battery to high temperature and dwelling in a full state-of-charge for an extended time can be more stressful than cycling. Table 3 demonstrates capacity loss as a function of temperature and SoC.
Besides selecting the best-suited voltage thresholds for a given application, a regular Li-ion should not remain at the high-voltage ceiling of 4.20V/cell for an extended time. The Li-ion charger turns off the charge current and the battery voltage reverts to a more natural level. This is like relaxing the muscles after a strenuous exercise.
For the Hugo2 Rob implemented a smart charging scheme that doesn't top up past 4.05V per cel when left plugged in and there's the new desktop mode as well which bypasses the battery if left plugged in for more than 24 hours. Obviously they recognize the importance of not keeping the battery too 'full' and 'topped up' when used in a desktop environment.
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