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got the new charger (nicad) but the battery gets very hot (to a poit that there are bubbles on the minelab sticker) and shows charge of 8v the charger
- Thread starter tomcatpl
- Start date
Art (NWOH)
New member
If you are attempting to charge the standard Minelab ni-cd pack, then the pack has multiple bad cells. The pack will not work, and you are going to fry the charger.
Get a new battery pack.
HH
Get a new battery pack.
HH
Critterhunter
New member
Make sure the charger you are using is meant for whatever you are charging...nimhs or nicads. Nimhs are better in some respects than nicads but they drop less in voltage when peaked. This is how the charger tells the pack is charged. When fully charged the per cell voltage will start to drop instead of continue to climb. This is how a charger tells the pack has reached it's peak. Nicads will drop further in voltage and trigger the charger to shut off. Charging nimhs on a nicad charger might now drop enough in voltage to shut the charger off. Also, if you are trying to charge the pack at too high of an amp rate the cells could get very hot as well. If the pack has some bad cells or ones that are in a larger state of discharge than others (several cells near full charge while several are near dead) the pack could also get very hot as some cells are being overcharged while others are trying to catch up.
The only possible fix would be to hitch the pack up to a car light bulb and allow it to drain completely dead. Even after the light goes out let it sit hitched up to the bulb for several more hours to insure all cells are drained. Some say to attempt to fix a pack it should then be charged at a high amp rate, say 1 amp. It is said that this will break down any crystals causing high resistance and the pack not to charge properly. It should then be drained back down and then charged at a slow amp rate that will take at least 10 hours.
NOTE: If you don't know what you are doing then don't risk this. Explosion, fire, or worse could result. I've done it in the past but in a fire box in the middle of my driveway and I would only go near it with goggles, gloves, and protective clothing. Better to just buy a new pack or charger than risk something like this.
The only possible fix would be to hitch the pack up to a car light bulb and allow it to drain completely dead. Even after the light goes out let it sit hitched up to the bulb for several more hours to insure all cells are drained. Some say to attempt to fix a pack it should then be charged at a high amp rate, say 1 amp. It is said that this will break down any crystals causing high resistance and the pack not to charge properly. It should then be drained back down and then charged at a slow amp rate that will take at least 10 hours.
NOTE: If you don't know what you are doing then don't risk this. Explosion, fire, or worse could result. I've done it in the past but in a fire box in the middle of my driveway and I would only go near it with goggles, gloves, and protective clothing. Better to just buy a new pack or charger than risk something like this.
This is something some dont watch for as they try to use a charger not made for the Battery pack you are chargeing. Some are even charging at a very high rate and some have differnt polarity on the plug and this will cause a battery also too get very hot.
I remeber not long ago someone was going to buy a charger that was made for some other type of battery so they could charge their batttery faster and this charger would have cooked the battery as the charge rate was way to high.
I remeber not long ago someone was going to buy a charger that was made for some other type of battery so they could charge their batttery faster and this charger would have cooked the battery as the charge rate was way to high.
Critterhunter
New member
Critterhunter said:
Can't edit my message...That should read "might NOT drop enough"!
the charger you got from onlybatteries.com should work fine, if YOU changed the insert from your old charger make sure you don't have it reversed or shorting, they sell a proper lead for a couple of bucks.
the charger will detect the amount of cells and charge accordingly(6 to 10 cell) Mine gets warm but not hot, the battery pack very slightly warm if it was completely flat
the charger will detect the amount of cells and charge accordingly(6 to 10 cell) Mine gets warm but not hot, the battery pack very slightly warm if it was completely flat
Critterhunter
New member
You most likely have a bad cell(s) in the pack if you are using the proper charger, proper settings, and proper polarity. When cells go back others will get overcharged as the pack tries to reach proper voltage. This can be a major fire hazord so don't play around. Another thing that can happen is the pack will get so hot that the cell tab solder connections can melt, causing a dead short across the pack. Now you've got a potential bomb or fire waiting to happen. I've seen this happen in the field when a 7 cell nimh pack came down after a flight on a friend's plane. It went nuclear within minutes.