Register | Log in
 
Electric-RC-Helicopter.com's Homepage
AlbumAlbum  | FAQ | Search | Memberlist
 

Lipo batteries


Custom Search
Post new topic   Reply to topic
Electric Rc Helicopter Forum Index -> Electronic, Parts, Components, Batteries, and Chargers
 
Advertisements


View previous topic :: View next topic  
Author Message
mick29
Hopping Maniac
Hopping Maniac


Joined: 29 Mar 2011
Posts: 20
Location: south australia

PostPosted: Thu Jan 31, 2013 2:07 pm
PostPost subject: Lipo batteries
Reply with quote

Hows it going this is proberly a questions asked alot but im going to ask it anyway, what is the best way to look after your lipo batteries I have had two batteries the same but one packs up along time before the other even though there charged and stored the same thanks mick29
Back to top
View user's profile Send private message
matelot
Extreme 3D
Extreme 3D


Joined: 09 Jan 2012
Posts: 331
Location: Back in Blighty

PostPosted: Thu Jan 31, 2013 9:31 pm
PostPost subject:
Reply with quote

It has to be not over-discharging them i.e. monitor them as often as possible;
use a decent balance charger;
storage charge when not in use;
stop flying if batteries overly warm/hot;
don't charge if overly warm/hot;

Bound to be some more from others.
Back to top
View user's profile Send private message
tombo242
Admin
Admin


Joined: 04 Nov 2008
Posts: 4709
Location: Santo EstÍv„o, East Algarve, Portugal. Now 81, but still feels 19.

PostPosted: Thu Jan 31, 2013 9:36 pm
PostPost subject:
Reply with quote

G'Day Mick,

You're going to get a few answers on this one as many people think different ways. Here's mine (take it or leave it folks).

All of Keiths' suggestions plus:

1. Always bring your li-pos back to storage level after use. 3.8~3.9V/cell

2. Never leave them fully charged or discharged for any longer that it takes to get back from the field.

3. If stored for any length of time recharge to storage level every month.

I have batteries that are still good after 4 years flying so I know this works, I would never leave a fully charged battery overnight.

Li-Pos are dangerous items and have to be handled with care and attention.

Here's a link for a second opinion.

Tom.
Back to top
View user's profile Send private message
SkyHigh
Flying Inverted
Flying Inverted


Joined: 05 Mar 2012
Posts: 68

PostPosted: Fri Feb 01, 2013 8:31 am
PostPost subject:
Reply with quote

Fully Charged 4.2v per cell

Store Charge 3.7v to 3.85v

Fully Discharged 2.5v to 3.2v per cell

Store 3 cell = 11.55v

Store 6 cell 23.1v
Back to top
View user's profile Send private message
Burgess
Extreme 3D
Extreme 3D


Joined: 27 Mar 2012
Posts: 1028
Location: Wales

PostPosted: Fri Feb 01, 2013 12:30 pm
PostPost subject:
Reply with quote

Hi Mick,

Get yourself a Watts meter and you'll be able to see what's happening to your LiPO during flight conditions. Have a look at the one via the link to 4-Max.co.uk in the Watts Meter thread.


Burgess
Back to top
View user's profile Send private message
laneritc
Extreme 3D
Extreme 3D


Joined: 08 Mar 2011
Posts: 100
Location: georgia

PostPosted: Tue Feb 12, 2013 6:29 am
PostPost subject:
Reply with quote

Another lipo question, didn't get to fly from mid August to last saturday. got my MQX out batteries had been stored at 3.8 volts, charged a couple up with factory e-flight celeste charger on Friday night. before could fly two cycles of 6 minutes each, temps were in mid 40's after about five minutes low voltage waring kicked in, this happedon on both batteries. both recharged to 4.2 volts haven't got to fly again yet due to weather, is this normal for a battery after storage? never had this problem with 2 or 3 cell batteries. thanks for any imput, feels good to fly again, (batteries in question are 1s 3.7v 500mah 12c) Thanks Lane.
Back to top
View user's profile Send private message
tombo242
Admin
Admin


Joined: 04 Nov 2008
Posts: 4709
Location: Santo EstÍv„o, East Algarve, Portugal. Now 81, but still feels 19.

PostPosted: Tue Feb 12, 2013 8:18 pm
PostPost subject:
Reply with quote

Did you check for the 3.8V before starting to recharge? Once used, your batteries do tend to discharge while in storeage. It is best to check them every month or so and make sure that they are still at the right level.

If the storeage voltage is allowed to drop, you will get very much reduced flight times due to the increased internal resistance allowing the regulator to cut in. The battery will show a full charge, but if you check the mAh put back in after one of these flights you will find that it is proportional to the flight time. Checking the battery after it trips the regulator with a volt meter will show quite a high voltage, but if you check it under load, then you will see the reduced power.

Tom.
Back to top
View user's profile Send private message
laneritc
Extreme 3D
Extreme 3D


Joined: 08 Mar 2011
Posts: 100
Location: georgia

PostPosted: Tue Feb 12, 2013 9:39 pm
PostPost subject:
Reply with quote

Thanks Tom makes more sense to me now. So after several charge/discharge cycles do you think they will improve? Thanks Lane
Back to top
View user's profile Send private message
Andy456
Hover Master
Hover Master


Joined: 11 Mar 2013
Posts: 10

PostPosted: Thu Jul 04, 2013 4:46 pm
PostPost subject:
Reply with quote

LVC settings are very dependent on LOAD. Many chargers will not attempt to charge lipos with voltages below 3.5 volts per cell. I have always used the below chart by IA-Flyer. Running your packs below 80% capacity is not good for them .... and I have packs with hundreds of discharges over many years that still perform as good as new.

Don't run past 80% capacity. Store at 50% discharge (3.80 - 3.85 volts per cell). These are the two rules I have always followed with excellent results.

4.20v = 100%
4.03v = 76%
3.86v = 52%
3.83v = 42%
3.79v = 30%
3.70v = 11%
3.6?v = 0%

Capacity below 3.7v "resting" is not usable for flying, it's where the battery voltage dump begins.

Every lipo discharge curve I have seen backs up the above voltage versus capacity data.


Regards.
Andy.
Back to top
View user's profile Send private message
solentlife
Extreme 3D
Extreme 3D


Joined: 30 Dec 2010
Posts: 914
Location: Latvia / UK

PostPosted: Wed Oct 09, 2013 12:24 pm
PostPost subject:
Reply with quote

Andy456 wrote:
...... Running your packs below 80% capacity is not good for them .... .....
Don't run past 80% capacity.......
Regards.
Andy.


Do you mean do not USE more than 80% of the capacity ... as stopping use AT 80% capacity would be very short flight times ... Wink
Second 80% is a lot higher than storage level and that in itself would be detrimental to the pack - even if storage level was made by discharging after flights.

Nigel
Back to top
View user's profile Send private message
Display posts from previous:   
Electric Rc Helicopter Forum Index -> Electronic, Parts, Components, Batteries, and Chargers All times are GMT + 7 Hours
Post new topic   Reply to topic
Page 1 of 1
Jump to:  

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum




Electric Rc Helicopter topic RSS feed 

SmartFeedSmartFeed




Electric-RC-Helicopter.com