Keeping EVO II Batteries on charging hub

[panampefa]

Has anyone ever had any issues with keeping the EVO II batteries on the charging hub (plugged in) for log periods of time? (i.e storing them that way).
Any knowledge of its' effect on battery life?

 

[tvwxman]

There are a lot of people here who know more about it than I do, and you might want to search the forum for battery threads, there are quite a bunch! But I don't think that is recommended. The best analogy I remember hearing is keeping your batteries fully charged all the time is like taking a rubber band, and stretching it to its limit and keeping it there. Not a great thing for the rubber band over time. That's why the batteries are designed to self-discharge after a given number of days if they aren't used by then.

Generally I don't charge my batteries until I know I have a flight coming up, and while I'm in between projects, I'll store my batteries with around a 50% charge. I've gotten good life from them with this approach. Again, there may be a better philosophy out there, but that's been my comfort zone.

 

[panampefa]

Thx for the reply "tvwxman". One would think that the battery charger would have some sort of intelligent charging circuitry to it but I've never been able to determine this.

 

[NickB]

Thx for the reply "tvwxman". One would think that the battery charger would have some sort of intelligent charging circuitry to it but I've never been able to determine this.

The battery is intelligent. It will reduce to about 60% power after several days that you can set using controller. Do not leave on charger.

 

[uas_gian]

I recommend a search in this forum for topics about “battery shelf life”.

Moreover our drones are using LiPo batteries, there is plenty of general useful information online outside this forum, explaining why LiPo batteries should be kept in storage below maximum charge and above an incidental full discharge. On top of that the temperature of the storage location can play a role.

look it up and read, read, read it.

 

[panampefa]

The battery is intelligent. It will reduce to about 60% power after several days that you can set using controller. Do not leave on charger.

NickB - OK with this being stated:
"....battery is intelligent. It will reduce to about 60% power after several days that you can set using controller..."
anyone have a suggestion as to the "optimal" battery power reduction percentage setting over time for best battery lifespan?
I guess my question is why is 60% reduction in power after several days a good thing?

 

[uas_gian]

A LiPo battery fully charged or at a charge below critical can turn into a fire hazard under unexpected circumstances. So having it stored at 60% is a safety measure, it can then naturally discharge to 40% or less and also shouldn’t get below 10%. Any high voltage, indicated as 90% or more over a longer time is dangerous in certain environments. So this is the reason why the smart battery will reduce the voltage for its cells when they are sitting on a shelf doing nothing. Topping up the idle battery pack once every few months is a good way to go.

 

[panampefa]

A LiPo battery fully charged or at a charge below critical can turn into a fire hazard under unexpected circumstances. So having it stored at 60% is a safety measure, it can then naturally discharge to 40% or less and also shouldn’t get below 10%. Any high voltage, indicated as 90% or more over a longer time is dangerous in certain environments. So this is the reason why the smart battery will reduce the voltage for its cells when they are sitting on a shelf doing nothing. Topping up the idle battery pack once every few months is a good way to go.

All makes sense .. thanks uas_gian for your feedback..

 

[NickB]

NickB - OK with this being stated:
"....battery is intelligent. It will reduce to about 60% power after several days that you can set using controller..."
anyone have a suggestion as to the "optimal" battery power reduction percentage setting over time for best battery lifespan?
I guess my question is why is 60% reduction in power after several days a good thing?

40% reduction and unsure why that's the number.