LiPo battery storage voltage

[JayP]

Hello.
After searching and reading many threads on general battery info, I still have a question regarding proper battery storage voltage.
Here is what I know:
Each cell needs to be stored at 3.7-3.8V
Lipo batteries should never be stored, fully charged
But what I don’t understand is that 3.7 x 4 = 14.8V which is for a 4S battery fully charged ... that confuses me totally.
I just purchased two 4S batteries, brand new and never used, I opened the boxes and checked data with my Onyx 245 and it reads 3.7V per cell for one (14.8V total)and 3.8V per cell for the other (15.3V total) and if I try to charge them both I get a «*err.7*» reading which means high voltage.
So, how am I to accept that I have to store my batteries at storage safe voltage of 3.7V per cell when in fact that voltage is way beyond the max voltage of the battery, hence fully charged...
Someone please? Am I the only one not getting this??

 

[Peaker]

When i store my 3000 mah batteries to 2000 mah they are at 11.6 volts as i recall

 

[magic_yeti]

Fully Charged per cell 4.2 V, Storage : 3.7 - 3.8V (aprox 60%), Critical under 3.0 V. cut off i use 3.2 V.

 

[Hydrocarbon92]

3.7v is "nominal" voltage, but 4.2v is fully charged for a typical Lipo & 3.6v is discharged (resting, not loaded). Below 3.6v can be done but reduced battery life. Other examples: 1.2v is nominal for NiCd and NiMH but they can go up to almost 1.5v fully charged. Lead-acid car battery is 12v nominal & 2.1v per cell nominal, but your alternator will charge them up to 14.5v. Clear as mud.

As long as it's below 4v, you can store it safely. 3.8v is ideal & offers the absolute longest cell life. If your charger is giving errors at 3.7-3.8v, it's likely bad.

 

[mikemcE]

Storage is 3.75v
Full charge is 4.21
My 3s fully charged are 12.6v
4s are 16.8v


Hang up and Drive

 

[OCD Mods]

Hello.
After searching and reading many threads on general battery info, I still have a question regarding proper battery storage voltage.
Here is what I know:
Each cell needs to be stored at 3.7-3.8V
Lipo batteries should never be stored, fully charged
But what I don’t understand is that 3.7 x 4 = 14.8V which is for a 4S battery fully charged ... that confuses me totally.
I just purchased two 4S batteries, brand new and never used, I opened the boxes and checked data with my Onyx 245 and it reads 3.7V per cell for one (14.8V total)and 3.8V per cell for the other (15.3V total) and if I try to charge them both I get a «*err.7*» reading which means high voltage.
So, how am I to accept that I have to store my batteries at storage safe voltage of 3.7V per cell when in fact that voltage is way beyond the max voltage of the battery, hence fully charged...
Someone please? Am I the only one not getting this??

3.7 is not fully charged voltage. Fully charged is like 4.2 per cell. 3.7 is nominal voltage? Something like that. Most adjustable chargers allow you to choose up to 4.2v per cell for Lipo batteries. I am sure someone with more knowledge than me will break this down better.

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[JayP]

Got it!
Thank you all for your input+

And if I may ask: what charger (that also discharge for storage) would you recommend?
I will only use Lipos

 

[Teng]

My 4S LiHV stored at 3.92 per cell[emoji7]


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[mikemcE]

Got it!

Thank you all for your input+



And if I may ask: what charger (that also discharge for storage) would you recommend?

I will only use Lipos

Hang up and Drive

 

[Hydrocarbon92]

An AC charger is obviously a bit more convenient if you travel with it a lot. However 150W is under 6A for two 3S batteries.

You can get a lot more value & power with ISDT chargers if you don't mind a separate power supply. You could get a 14A/300W charger with a Meanwell clone, you just have to add a cord. I've been using a Meanwell clone for 5 yrs now for a different project which usually uses ~225W. Banggood also sells these from their China warehouse so that will save on shipping if you don't need it asap; Hobbyking also sells them.

https://www.banggood.com/ISDT-Q6-Pl...p-1103946.html?rmmds=search&cur_warehouse=USA
https://www.banggood.com/Wholesale-...V-p-39987.html?rmmds=search&cur_warehouse=USA

 

[betty]

And there are also some HV lipos, which could be charged to 4.35 each cell.

 

[Teng]

And there are also some HV lipos, which could be charged to 4.35 each cell.

My Wraith is in 4S LiHV now :ror:

 

[Motorider]

Got it!
Thank you all for your input+

And if I may ask: what charger (that also discharge for storage) would you recommend?
I will only use Lipos

I use an isdt t8 charger. I convert server power supplies into 575w 35amp 12.v power supplies. You can also use one of the smaller t6 or other cheaper options. I don't think there is a better option for the money than the isdt chargers. This makes parallel charging a breeze with their high current capabilities.

For example I can hook up 6 3s packs of any size at the same time and balance charge them all at the same time. So with say 6 2200mah 3s packs you can charge at 13.2 amps for a 1c charge. If you jump to 4300mah 3s packs, you can charge at 25.8 amps. You can mix and match, you just have to match voltage and add up the total mah to get the 1c charge.

If you don't want to do the power supply, let me know and I can hook you up.

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[JayP]

I use an isdt t8 charger. I convert server power supplies into 575w 35amp 12.v power supplies. You can also use one of the smaller t6 or other cheaper options. I don't think there is a better option for the money than the isdt chargers. This makes parallel charging a breeze with their high current capabilities.

For example I can hook up 6 3s packs of any size at the same time and balance charge them all at the same time. So with say 6 2200mah 3s packs you can charge at 13.2 amps for a 1c charge. If you jump to 4300mah 3s packs, you can charge at 25.8 amps. You can mix and match, you just have to match voltage and add up the total mah to get the 1c charge.

If you don't want to do the power supply, let me know and I can hook you up.

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And if I wanted to purchase a power supply, what would you recommend with a T6?
Also, i just want a simple, safe charger/discharger and yes it looks nice and cool but I then have to purchase a separate p-supply and also solder the XT60 connector to that supply. I don’t even know what kind of battery output connector is on this charger. Hopefully they are simple banana connectors so I can reuse my wires with my EC5 battery connectors...
I like hobbying around my RC but when it comes to be passionate about a charger, sorry guys you’re losing me

 

[Motorider]

And if I wanted to purchase a power supply, what would you recommend with a T6?
Also, i just want a simple, safe charger/discharger and yes it looks nice and cool but I then have to purchase a separate p-supply and also solder the XT60 connector to that supply. I don’t even know what kind of battery output connector is on this charger. Hopefully they are simple banana connectors so I can reuse my wires with my EC5 battery connectors...
I like hobbying around my RC but when it comes to be passionate about a charger, sorry guys you’re losing me

I make them pretty cheap. Pm me if interested. It is simple. The charger uses xt60 for dc input and charger output. What's nice is that out on the trail you could have one large pack and use it to power the charger and charge you small packs.

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[Hydrocarbon92]

I like hobbying around my RC but when it comes to be passionate about a charger, sorry guys you’re losing me

Hobbyking doesn't make the charger, they simply resell it. ISDT is a Chinese company, but their product is on par with reputable American brands that have their product made in China. You can even update the firmware, and they've been posting updates for their chargers regularly.

As far as connectors, ISDT uses XT60 for in & output, technically female 3.5mm bullets. You can get an XT60 to 4mm adapter and re-use all your old items that connected to 4mm. Just make sure the wire is thick enough. I used good 16awg on my old 10A chargers but got quite warm, so I chose 12awg for my ISDT.

 

[sportbikeco]

That psu will do 26A at 12v?

 

[JayP]

THx for your answers

Say I go for a Q6 lite
I have 3S and 4S batteries I need to charge
I am not in a hurry when I charge them so I don’t care if it takes a while for them to charge
My last question is: would a 19V - 90W converted PC P-supply connected with a female XT60 do the job?

 

[Motorider]

That psu will do 26A at 12v?

That power supply will do 35 amps at 12v. With 2 of them I can put them in series and get 35 amps at 25v. Or go with 2 in parallel and 2 in series. 4 supplies and get 70 amps at 25v.

They are actually about 12.4-12.5v out each.

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[Motorider]

THx for your answers

Say I go for a Q6 lite
I have 3S and 4S batteries I need to charge
I am not in a hurry when I charge them so I don’t care if it takes a while for them to charge
My last question is: would a 19V - 90W converted PC P-supply connected with a female XT60 do the job?

It would, but if you parallel charged packs to take advantage of the q6 power, it will overheat that power supply. So at 90 watts and 19v, there is only 4.7a available to power the charger, it's fan, and charge your pack. So that would not be a very good option. You can get the server power supplies for 15 to 30 shipped from the fleabay. You can then modify them to suit you.

With the q6 and a good power supply you could charge 6 2200 packs at 1c all at the same time with a parallel board.



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