Started by e-flite_rules, July 26, 2019, 11:29:43 am
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Quote from: e-flite_rules on July 26, 2019, 11:29:43 amI always though that soaking them in salt water was a sure fire (or non fire!) way of achieving this. However some people have suggested that this isn't a good idea - corrosion might set up high resistance paths so that the discharge was never achieved.
Quote1. Why such a low discharge rate of C/10? Modern day cells can all cope with 10C without damage - And we're not worried about damage - we're trying to kill them!
Quote from: leckyBB on July 26, 2019, 16:12:51 pmI have another alternative solution for you. Put battery in model and fly as normal but terminate flight in a large hawthorn tree. Leave for 24 hours while gathering the necessary equipment to retrieve model. Get scratched all over while recovering model in 40degC heat. Remove battery (in my case a new one only used once) and test it. All cells at 0.00v.Order a new battery while tending to scratches.ps: I normally destroy my end of life LiPo's using the salt bath method.
Quote from: RobC on July 26, 2019, 13:48:57 pmI thought that current wisdom is that lithium based cells should not be put in with general waste, is that to prevent lithium and cobalt getting into groundwater or just to prevent the dustmen getting incinerated?
Quote from: frank on July 26, 2019, 22:11:48 pmI know I should not say this, but couldn't resist it........... It's far more fun to take say an old worn out 3s 2200 pack outside and drive a sharp screwdriver through it !Most results I've had are a bit disappointing.... Smokes and fizzes a bit, then it's definitely dead, after cooling down !Done it a few times and never had one burst into flames.Sorry for my politically incorrect disposal method !
Quote from: PDR on July 26, 2019, 13:56:17 pmNot so. Corrosion is itself an electrolytic process and so it cannot occur in the conductors in such a manner as to prevent a current that is already flowing. It cannot occur inside the cells themselves in any manner detrimental to discharging because the actual process which produces the current is corrosion of the cell plates, so any corrosion that can happen is already happening and it's helpful rather than detrimental.But anyway:This is true, but only down to the point of no return (typically about 3.5v/cell for a modern lipo or 3v/cell for an older one). Discharging beyond thois point at ANY current very much DOES damage the cells, and we all know. If you carry on discharging below this voltage at high currents there is a very high risk of plate damage, fire and a Corbyn government, which is why when COMPLETELY discharging cells for disposal it must be done at a lower rate. If the bucket of saline option doesn't dingle your dangle then just stick a 1kohm resistor across the leads and leave them outside for a month. measure the voltage across the resistor every couple of days - when it gets down to a few millivolts they're done.The bucket of saline thing is still the safest method though - the water keeps the cells cool and prevents significant events should the cells decide to go into a runaway melt-down or similar (rare, but not impossible).€0.000008 supplied,PDR
Quote from: e-flite_rules on August 01, 2019, 14:27:03 pmIf my rubbish truck suffers a fire I'll blame PDR.
Quote from: Bad Raven on August 04, 2019, 08:25:41 amIf you get ANY reaction to shorting/puncture after salt water treatment you did not have an effective process!! (and reinforces why the council here are erring on the safety side quite correctly)
Quote from: itsme on August 04, 2019, 12:03:26 pmI know the haters will jump in, but I have had excellent results with these cheapos.https://hobbyking.com/en_us/zippy-compact-2200mah-3s-25c-lipo-pack.html?countrycode=GB&gclid=Cj0KCQjwhJrqBRDZARIsALhp1WSdImuWBFq50sj3rLQg-vzyYsDT-2KXsZdlx45sg0bSrTaRFAsTvrAaAihHEALw_wcB&gclsrc=aw.ds&___store=en_us
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