Model Boat Mayhem
Technical, Techniques, Hints, and Tips => Batteries & Chargers => Topic started by: hover tim on June 21, 2009, 06:55:28 pm
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I have got some batteries that wont charge up is there any solution or are they cream crackerd
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Assuming that the charger is not the guilty party, yes, cream crackered.
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Are you trying to quick charge them? If so, give them a try on a slow charger, discharge and slow charge them again. Do this a couple of time finally giving them a slow charge until full.
If they wont slow charge, then yes, they're gonnas!
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Hover tim
I'm assuming that the batteries are literally that - several cells connected in series
If you suspect them of potential knackeredness try the slow charge - if they don't revive remove the wrappings and check each cell for voltage - it is sometimes just one cell which is dead - and sometimes it is very obvious which it is because of colour, corrosion or whatever. Sometimes it is a connection between cells which had broken or corroded.
So yes - very high probablility of being effectively dead, but sometimes on investigation you can be pleasantly surprised :}
andrew
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what type of batteries are they ,?
a tip if you haven't used your mobile phone for some time (as in spare) and come to charge it they normally wont charge, if you take the batteries out and put a pp3 9v battery positive to positive neg to neg or 30 seconds then put it straight in and plug in it will start to charge and you should be on , sometimes it need s to see some volts so it knows there is a battery there.
Proteus
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they are nicad batteries i have head about this method before but never tried it
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If they are old Ni-Cads, it is possible they have simply suffered 'black wire' corrosion. This happens to the nicad black negative wire,it degrades and turns black... hence the term, and will no longer conduct. Try checking this by removing some of the black insulation and if the wire shows this symptom, remove the battery leads, replace them and try recharging. You may be pleasantly surprised and thereby save yourself a few quid.
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The symptoms aren't confined to NiCd batteries - I have also come across it on NiMh & lead acid cells and even on the DC section of mobile freezer power packs