My 'rapid charger' charges my 2100 mah batteries in about an hour, and when they come out of the charger they're almost too hot to hold without changing hands. I've wondered about that myself, but I've had this set for a little over a month, and about 5 or 10 charges, and they still seem to be working fine.Ryanjanus75060wrote:Yes, it's normal especially after the light just went green. If youwaited a little longer and leave them in the charger, they won't beso hot anymore. I usually don't take them out right away when thelight went green.TPG2Kwrote:I just finished charging a brand new set of 2100 mah Ni-MH AABatteries. Just wondering if it's normal for them to be super hotto the touch after they have finished charging? Is this normal as Iam new to charging batteries.Thanks,Lance. Mr.Bwrote:My 'rapid charger' charges my 2100 mah batteries in about an hour,and when they come out of the charger they're almost too hot tohold without changing hands.

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I've wondered about that myself, butI've had this set for a little over a month, and about 5 or 10charges, and they still seem to be working fine.Ryanhmmmmmm 2100 milliamps per hour sounds 3 times the rate of my charger. My batteries are warm at this rate. I can believe they would get hot at 3 times the current flow. I will keep mine at a warm 750 milliamps per hour, as I suspect the elevated heat will shorten battery life at the least. I've had a set 'sweat' once when I tried a 'fast charger'.Good luck.-Mike ChinnockSanyo VPC-X350 HP C912 Fuji S602Kenko VC-200HISunpak 611 Vivitar 91HP Photosmart P1000, 1115. Mike Chinnockwrote:Mr.Bwrote:My 'rapid charger' charges my 2100 mah batteries in about an hour,and when they come out of the charger they're almost too hot tohold without changing hands. I've wondered about that myself, butI've had this set for a little over a month, and about 5 or 10charges, and they still seem to be working fine.Ryanhmmmmmm 2100 milliamps per hour sounds 3 times the rate of mycharger.

My batteries are warm at this rate. I can believe theywould get hot at 3 times the current flow. I will keep mine at awarm 750 milliamps per hour, as I suspect the elevated heat willshorten battery life at the least. I've had a set 'sweat' once whenI tried a 'fast charger'.Good luck.-Mike ChinnockI second Mike's remarks.

Rapid chargers are known to reduce the lifespan of batteries. Now if your charger had a temperature sensor to limit the charge that would probably not happen.

Good chargers should shut off if temperature of the battery exceeds 50 celsius. I have a MaHa charger and batteries get really warm, almost hot and that's under a 2-3 hour charge rate. I'm sure that above that you'll get boiling and corrosion issues that will shorten the cell's life expectancy.Sanyo VPC-X350 HP C912 Fuji S602Kenko VC-200HISunpak 611 Vivitar 91HP Photosmart P1000, 1115.

Just curious.are y'all using the Energizer rapid charger, and the new Energizer 2100 maH batteries?Just wondered.I am, and my batteries get very hot too.TMMr.Bwrote:My 'rapid charger' charges my 2100 mah batteries in about an hour,and when they come out of the charger they're almost too hot tohold without changing hands. I've wondered about that myself, butI've had this set for a little over a month, and about 5 or 10charges, and they still seem to be working fine.Ryanjanus75060wrote:Yes, it's normal especially after the light just went green. If youwaited a little longer and leave them in the charger, they won't beso hot anymore. I usually don't take them out right away when thelight went green.TPG2Kwrote:I just finished charging a brand new set of 2100 mah Ni-MH AABatteries. Just wondering if it's normal for them to be super hotto the touch after they have finished charging? Is this normal as Iam new to charging batteries.Thanks,Lance. My charger is a Sanyo and takes 4 hrs to charge 4 1850 mAhThey get quite hot but not burning hot such that I can't hold them.I've been using the same batteries for over 8 months now and there still going strong.

I haven't noticed any degradation by use (I have not scientific measured any changes)I read somewhere earlier that if it takes 1 or 2 years to wear out the batteries due to quick charging, and you need the quick charging facilities then by all means quick charge (even if they cause the batteries to become hot) as a replacement set with higher rated mAh are cheap.Lennywrote:My New S 602 Z came supplied with a Hahnel Power Station TC Compactcharger. It charges 4 AA size Ni-Mh which get noticeably hotterthan batteries charged in the charger supplied with my old Fuji 206Zoom. Charging takes in excess of twelve hours.

83bj60wrote:I second Mike's remarks. Rapid chargers are known to reduce thelifespan of batteries.

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Now if your charger had a temperature sensorto limit the charge that would probably not happen. Good chargersshould shut off if temperature of the battery exceeds 50 celsius. Ihave a MaHa charger and batteries get really warm, almost hot andthat's under a 2-3 hour charge rate. I'm sure that above thatyou'll get boiling and corrosion issues that will shorten thecell's life expectancy.I've got a Fuji rapid charger (2 hours), made by Fuji and supplied with their own batteries. You'd think they'd know if it was safe or not for their own batteries. Has a cut-out at the end of the charge. Mine come out quite hot but cool very quick.Anyway, battery life is absolutely perfect after 2 years of frequent charging (both Fuji's own and some Uniross 1800mAh batteries)NiMh are far more tolerant anyway and don't suffer memory effects etc that old Nicds do.

Base on this website, NiMH and NiCad batteries in fact prefer fast charges over slow charges. However, heat is a problem, but well-designed chargers should have 3 protection methods:1. Negative Delta V (NDV)2.

Timer83bj60wrote:I second Mike's remarks. Rapid chargers are known to reduce thelifespan of batteries. Now if your charger had a temperature sensorto limit the charge that would probably not happen. Good chargersshould shut off if temperature of the battery exceeds 50 celsius.

Ihave a MaHa charger and batteries get really warm, almost hot andthat's under a 2-3 hour charge rate. I'm sure that above thatyou'll get boiling and corrosion issues that will shorten thecell's life expectancy. AFAIK, well-designed and made chargers, especially rapid ones, should have temperature control that would not allow the temperature exceed acceptable level.The temperature should reduce after fully charged.

If the temperature stays high after fully charged, the charger is probably defective.I had a GP USB charger, it doesn't seem to have any protection circuit at all (tried to disassemble it but it uses some strange screws, maybe later.) that the batteries were really HOT to touch after fully charged.TPG2Kwrote:Thanks for the info guys! I have an olympus BU-100 and it only took3 hours to charge up the 2100 mah. They did cool down about 15minutes after the charge was complete. I was a little worried fora while that this was not normal however sounds like everyone hasthe same effects.L. TPG2Kwrote:I just finished charging a brand new set of 2100 mah Ni-MH AABatteries. Just wondering if it's normal for them to be super hotto the touch after they have finished charging?

Is this normal as Iam new to charging batteries.I've been charging Ni-Cds and Ni-MHs for many years (I'm still using my first set of 1300 Ni-MHs) and a slow charge would make them gently warm, but the newer faster chargers certainly seem to get them much warmer and this appears to be perfecty normal, as others have already suggested.My Uniross Ultra Fast Charger says in the instructions that batteries will become hot during the charging process and this is normal and to disconnect the charger at the end of the charge cycle and allow batteries to cool before handling. They get pretty warm, but not actually too hot to pick up. 2000mAh Ni-MHs take an hour or so to charge in it, 1300s less time. DeadKennywrote:83bj60wrote:I second Mike's remarks.

Rapid chargers are known to reduce thelifespan of batteries. Now if your charger had a temperature sensorto limit the charge that would probably not happen. Good chargersshould shut off if temperature of the battery exceeds 50 celsius. Ihave a MaHa charger and batteries get really warm, almost hot andthat's under a 2-3 hour charge rate. I'm sure that above thatyou'll get boiling and corrosion issues that will shorten thecell's life expectancy.I've got a Fuji rapid charger (2 hours), made by Fuji and suppliedwith their own batteries. You'd think they'd know if it was safe ornot for their own batteries.

Has a cut-out at the end of thecharge. Mine come out quite hot but cool very quick.Anyway, battery life is absolutely perfect after 2 years offrequent charging (both Fuji's own and some Uniross 1800mAhbatteries)NiMh are far more tolerant anyway and don't suffer memory effectsetc that old Nicds do. Mike Chinnockwrote:You say you've had it a couple years. I figure Fuji shipped1500, or maybe 1600 mah batteries with it.

That would make itroughly a 750 milliamp per hour charger. 2 - 3 hours to chargea 2100 mah battery set.

I think it is trying to do that in an hourthat poses the proble. Maybe you are right, maybe Fuji knows whatthey are doing.It came with 1450mAh batteries. The packaging states it's a 1600mAh charger and will charge 2 in 110mins and 4 in 210mins.

I find it charges them quicker, more like 2 hours for 4, but then even though the camera insists they're flat they could still have some charge I guess.However I've been using 1800mAh batteries (maybe about a year and a half ago I got those, not sure), and they've been charging away perfectly fine without any noticeable damage to them at about the same rate. I've also been charging the 1450s on and off and they seem to last forever though they're in a low drain device now.