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General Discussion A place to talk about anything R/C or otherwise.

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  #1  
Old 2 Weeks Ago
anishmac anishmac is offline
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Lipo battery disposal

Where do we usually keep/dispose damaged lipo batteries ?
Do we have any recycling bin in our club ?
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  #2  
Old 2 Weeks Ago
briankizner briankizner is online now
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I don’t have an answer to the first question. I think it depends on the municipality where you live. As for question two, the club has no facilities to handle any waste. We ask all members not to leave any waste at the field.
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  #3  
Old 2 Weeks Ago
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Sempai-mj Sempai-mj is offline
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Quote:
Originally Posted by anishmac View Post
Where do we usually keep/dispose damaged lipo batteries ?
Do we have any recycling bin in our club ?
Find an ECO-Center near you, they take all batteries.
https://www.google.ca/search?q=find%...NlbnRlcigA;mv:[[46.166028999999995,-72.3809431],[45.192457399999995,-75.91775299999999]];tbs:lrf:!1m4!1u3!2m2!3m1!1e1!1m4!1u2!2m2!2m1!1e1! 2m1!1e2!2m1!1e3,lf:1

Last edited by Sempai-mj; 2 Weeks Ago at 11:38 AM.
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  #4  
Old 2 Weeks Ago
Tigron Tigron is offline
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Exclamation LiPo deactivation process

I would add, that before disposing the batteries, you should deactivate them.
Usually it is done with a can of salty water.
  1. Prepare the glass jar or plastic container that you can submerge the whole battery inside.
  2. Fill it with water and solve a lot of salt (like 1 tea spoon on 1 liter of water).
  3. Carefully cut or unsolder the wires of the battery - one by one. Only the battery electrodes should stay. Don't forget to isolate them with the tape to prevent accidental short.
  4. Submerge the battery into the prepared salty water and keep it outside of the house (as it will produce gases) for 24 hours. Make sure it stays on inflammable surface and can't short circuit with the walls of the container (can)
  5. When there is no more reaction (bubbles coming from the battery) the battery (with the water and most likely the the container) can be disposed.
This is done to prevent accidental fire. The electricity left in the battery will cause electrolyze process in the salty water and will dissolve one of the electrodes (so there will be nothing to short circuit) also it will completely drain the battery to zero and probably (not sure) salty water will react with lithium deactivating it.
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  #5  
Old 2 Weeks Ago
anishmac anishmac is offline
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Thanks everyone for the information
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  #6  
Old 1 Week Ago
Andrew Fernie Andrew Fernie is offline
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This is from a document by Thunder Power (battery pack supplier):


Quote:
** DISPOSAL OF LIPO BATTERIES **

Unlike NiCd batteries, lithium-polymer batteries are environmentally friendly.

For safety reasons, it’s best that LiPo cells be fully discharged before disposal (however,if physically damaged it is NOT recommended to discharge LiPo cells before disposal - see below for details). The batteries must also be cool before proceeding with disposal instructions. To dispose of LiPo cells and packs:

1. If any LiPo cell in the pack has been physically damaged, resulting in a swollen cell or a split or tear in a cell’s foil covering, do NOT discharge the battery. Jump to step 5.

2. Place the LiPo battery in a fireproof container or bucket of sand.

3. Connect the battery to a LiPo discharger. Set the discharge cutoff voltage to the lowest possible value. Set the discharge current to a C/10 value, with “C” being the capacity rating of the pack. For example, the “1C” rating for a 1200mAh battery is 1.2A, and that battery’s C/10 current value is (1.2A / 10) can be used, such as a power resistor or set of light bulbs as long as the discharge current doesn’t exceed the C/10 value and cause an overheating condition.
For LiPo packs rated at 7.4V and 11.1V , connect a 150 ohm resistor with a power rating of 2 watts (commonly found at Radio Shack)to the pack’s positive and negative terminals to safely discharge connecting it to an ESC/ motor system and allowing the motor to run indefinitely until no power remains to further cause the system to function.

4. Discharge the battery until its voltage reaches 1.0V per cell or lower. For resistive load type discharges, discharge the battery for up to 24 hours.

5. Submerse the battery into bucket or tub of salt water. This container should have a lid, but it should not need to be air-tight. Prepare a plastic container (do not use metal) of cold water. And mix in 1/2 cup of salt per gallon of water. Drop the battery into the salt water. Allow the battery to remain in the tub of salt water for at least 2 weeks.

6. Remove the LiPo battery from the salt water, wrap it in newspaper or paper towels and place it in the normal trash. They are landfill safe.
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  #7  
Old 1 Week Ago
Andrew Fernie Andrew Fernie is offline
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An interesting bit about that article is "Discharge the battery until its voltage reaches 1.0V per cell or lower." I have always used the salt water technique and was discussing it with someone who pointed me to this article. The rationale is that when you put a more highly charged pack in salt water the terminals can corrode before the battery has finished discharging. As long as you get the voltage low enough before going into the salt water the amount of energy left is so small that the corrosion isn't a problem. Presumably it is the copper oxide that is acting as an insulator and stopping the discharge. I would be interested to hear if anyone has gone through the salt water process then cut the cable to get a nice clean surface and checked the voltage.



Any chemists around that would like to comment on the corrosion theory?


Straight C/10 discharge with some form of load (appropriately sized resistor, light bulb, or an electronic load) is viable.



p.s. Forget you saw any reference to slashing cells in that article (just a reference for background, the article does not recommend it). Never. Never. Never.
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  #8  
Old 1 Week Ago
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Thanks Andrew,

6. Remove the LiPo battery from the salt water, wrap it in newspaper or paper towels and place it in the normal trash. They are landfill safe.

Plastic and rubber landfill
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Old 1 Week Ago
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Dwight Macdonald Dwight Macdonald is offline
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I have always discharged them as low as the charger would take them, then cut all the leads individually at slightly different lengths (so they don't short) and dropped the battery in salt water for a few weeks. I kept the bucket of salt water out in the back yard where it could not damage anything. Long after the bubbles stop coming from the ends of the wires, or the battery, I fish it out, cut the leads to show fresh copper and check to confirm 0 volts. The battery is then thrown in the garbage. I suppose if the battery was fully charged when placed in the salt water, the leads could corrode off and the discharging could slow or stop, but this is not very likely. A battery damaged in a crash that could not be safely discharged using a charger or a light bulb may be best destroyed directly in the salt water, with a careful check that all the cells are at 0 volts before putting it in the garbage.
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  #10  
Old 1 Week Ago
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Mezri Mezri is offline
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Teh New generation of chargers have the fonction ''kill lipo''...will discharge them the maximum...with the salted water it is an option as long as the lipo cells are still sealed...if pierced or physically damaged, watch this video :
https://www.youtube.com/watch?v=cTJh_bzI0QQ
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