batter damage? TK-40?

[almach1]

Any real long term damage done to my TK-40? The contacts did get some damage and a little dust inside the tube but i can shoot some compressed air to get it out.

the culprits are the durace precharged(non duraloops i believe). you can see the damage from the two cells. Does duracell do any reimbursement if this is any real damage?

 

[ragweed]

Sorry to hear that. Read on here that vinigar or baking soda will help clean it. Yes, Duracell, Energiser & Rayovac will cover the cost as long as the cells were not abused.

 

[csshih]

no long term damage, just clean it off and you'll be fine.

did all your cells have the same charge level?

 

[jhc37013]

From what have read from other members they do offer damage reimbursement. You should contact them immediately and send these photos to them. I'm curious dis this happen during use or down time?

Did you already have a thread about this or am I thinking of another thread.

 

[texaslightguy]

I just had proctor and gamble (Owns duracell) send me a check for 3 flashlights that their batteries ruined.

Trick is you have to call them, then the batteries need to be "in date" and depending on the value, they may want an opportunity to repair the product.

But they WILL take care of it. DO NOT Toss the batteries until it is settled.

BTW, we've seen a rash of leaked batteries lately, some dated as far out as 2013 and many never used. Not sure what that is about.

 

[almach1]

no long term damage, just clean it off and you'll be fine.

did all your cells have the same charge level?

i purchased all 8 at the same time from costco. all charged at the same time in a lacrosse bc-9009 charger. they are in their 3rd charge cycle.

in the pic of batteries i showed two cells that looked undamaged and the two that looked like they leaked.

 

[Ragiska]

i purchased all 8 at the same time from costco. all charged at the same time in a lacrosse bc-9009 charger. they are in their 3rd charge cycle.

what charge rate?

 

[almach1]

500 4 at a time. the max that charger goes is 1000

 

[Ragiska]

500 4 at a time. the max that charger goes is 1000

500 is too low. you probably cooked a couple cells.

 

[se4g4e]

500 is too low. you probably cooked a couple cells.

Please explain - why is 500mA too low a charge rate for AA's?

 

[Ragiska]

Please explain - why is 500mA too low a charge rate for AA's?

it won't provide a negative delta voltage signal for the charger to detect for termination. that leads to a missed termination, and over charge.

 

[waddup]

500 4 at a time. the max that charger goes is 1000

500 is too low. you probably cooked a couple cells.

Please explain - why is 500mA too low a charge rate for AA's?

it won't provide a negative delta voltage signal for the charger to detect for termination. that leads to a missed termination, and over charge.

interesting :candle:

 

[se4g4e]

it won't provide a negative delta voltage signal for the charger to detect for termination. that leads to a missed termination, and over charge.

Hmm...I always charge my AA's at 200mA-500mA, and that has not happened. :thinking:

 

[Ragiska]

Hmm...I always charge my AA's at 200mA-500mA, and that has not happened. :thinking:

and have you monitored them to be sure? checked internal resistance or cell impedance? temperature during charge? discharged them and verified that the charged capacity is not more than ~120% of discharge capacity?

charging at <.5C on the 9009 is a recipe for missed termination.

 

[T-roc87]

it won't provide a negative delta voltage signal for the charger to detect for termination. that leads to a missed termination, and over charge.

Hmm. Never heard of this but sounds fishy. I have never heard of a slow charge being damaging to cells. I have only heard of a fast charge being damaging via to many amps. Plus depending on the charger you can actually set up the delta voltage.

 

[almach1]

i guess i'll charge at 1000 using my BC9009. will be using 4 cells for now until i get 4 replacements.

 

[PerttiK]

I charge with 200 or 500mA on my bc700.
Not once has it failed to terminate.

 

[GrnXnham]

500 is too low. you probably cooked a couple cells.

I always charge mine at either 500 or 200. When I charge at 700 or 1000, the cells get hot and I heard that this can damage the cells. So which is worse--the heat or the low charge rate?

I always check my charge amount at the end of a charge and I don't think it's ever charged more than 120% of the listed capacity.

 

[Ragiska]

the suggested charge rate from EVERY manufacturer is .5-1C. if you switch to charging at 1C, the cells would almost definitely be cooler during charge. the fact that they are warm at the lower rate most likely means they are overshooting termination.

the correct charge rates are rather common knowledge if you learn anything about batteries. try reading through the battery forum, and the manufacturer charging practices documents.

 

[Locoboy5150]

Some batteries when new don't provide the negative delta voltage signal for the charger to stop charging. I read about it in the battery forum here on CPF. That's why others recommended that the first four or five charge cycles be monitored closely and don't let the charger determine when it should be turned off.

I have found that using the discharge function on my charger with new Eneloop and Duraloop batteries helps to get rid of that initial charge concern.

You're right though. Those damaged batteries are not Duraloops. They are the Duracell labeled Ray o Vacs.