crxman2010
Newly Enlightened
- Joined
- Apr 9, 2015
- Messages
- 1
I have Eneloops ranging from several years old to only a month or two and some of them are used infrequently so I decided to run a discharge test cycle on all my cells on the La Cross BC-1000 and take some notes. All of the batteries are AA Eneloop in either 2ah or 2.5ah capacity and I am using the 1000 mah charge/500 mah discharge function. What I am finding is that a couple of the cells in random charger slots will get very hot, infrared gun claims 125-128 degrees when I go to remove the cells from the charger after it has been sitting in the trickle charge mode. After noticing the second battery getting that warm, I started sitting a 5v 50 cfm fan on legs facing down at the charger to keep air moving around it which has lowered the temperatures during normal charging quite a bit but trickle charge mode is still heating up at random.
Example, about 6 hours ago my Eneloop Pros would have finished charging and had been sitting on the charger at 60 mah? trickle rate. Three of the cells ranged from 70-75 degrees and the fourth cell was 115 degrees. Ambient air was about 68 degrees with the ran running on the batteries the entire time. I have noted 6 cells out of 24 reaching temperatures over 110 degrees and up to 125 degrees with anywhere from less than 5 cycles on the battery to more than 50 and ranging in age from a month to several years... From what I could find online, they shouldn't be getting that hot after the 1000 ma charge is done and it doesn't seem like sitting on trickle charger for 2-8 hours should heat them up like that. It has happened in charger slot 1 & 3 and I believe 2. I wasn't taking note of which charger slot at first because I thought it was just the cell after it happened the first time or two.
Indication of bad cells? Charger need to be taken out back? or rather normal?
Example, about 6 hours ago my Eneloop Pros would have finished charging and had been sitting on the charger at 60 mah? trickle rate. Three of the cells ranged from 70-75 degrees and the fourth cell was 115 degrees. Ambient air was about 68 degrees with the ran running on the batteries the entire time. I have noted 6 cells out of 24 reaching temperatures over 110 degrees and up to 125 degrees with anywhere from less than 5 cycles on the battery to more than 50 and ranging in age from a month to several years... From what I could find online, they shouldn't be getting that hot after the 1000 ma charge is done and it doesn't seem like sitting on trickle charger for 2-8 hours should heat them up like that. It has happened in charger slot 1 & 3 and I believe 2. I wasn't taking note of which charger slot at first because I thought it was just the cell after it happened the first time or two.
Indication of bad cells? Charger need to be taken out back? or rather normal?