rechargable batteries?

[werewolf]

My July 10th post above got a response on July 19th - only mine was 2009 and the response was 2010 - one year later.

:)

Anyway, all my hybrids are still going strong.

[harrym]

Okay, I have gotten a lot more experience with rechargable batteries and my Maha smart charger.

Most of my 2,000mAH Enloops are now about 1,900mAH after I refresh and analyze. They've not had a lot of use. Is this decline expected?

My Maha generally shows something like... 1,905mAH, 253 minutes, 1.46 volts.

How should I group the batteries together? By mAH? By time? By volts?

[YuccaPatrol]

group them by mAH as that is the actual capacity of the batteries.

1900mAH is typical and good for the eneloops. That is within 5% of their specified rating.

[Marduke]

Actually 1900mAh is Eneloop's minimum rated capacity, so they still meet or exceed that. Note that the MAHA slightly underestimates capacity also.

[pub]

Great thread!

The best thing I found with the Maha C9000 is it performs an “impedance check” before it charges.

Typically alkaline and extremely aged battery will fail this test. For a rechargeable battery, it is recommended for the battery to be discarded.

I retired more that half of my rechargeables because they failed the test. This is probably why those old batteries were getting pretty hot when charging on a not-so-smart charger.

[harrym]

I've been playing a lot with my Enloops. Went caving in Mexico last week. On the way home I packed all of my batteries in my carry on luggage, including a few Lithium batteries.

As it turns out, you are not allowed to have more than 4 batteries in your possession when you exit Mexico. I had 24 Enloop AA batteries confiscated at the boarding gate.

[NZcaver]

As it turns out, you are not allowed to have more than 4 batteries in your possession when you exit Mexico. I had 24 Enloop AA batteries confiscated at the boarding gate.

What?? Why? You brought them in with you, right? Corrupt Mexican officials need batteries?

[jsniffin]

What is considered a cold cave? I thought everything underground was a constant 55ish degrees..

[NZcaver]

What is considered a cold cave? I thought everything underground was a constant 55ish degrees..

Maybe where you live. Where I am right now, they're in the 60's. Where I'm heading, many caves are around freezing.

[jsniffin]

What is considered a cold cave? I thought everything underground was a constant 55ish degrees..

Maybe where you live. Where I am right now, they're in the 60's. Where I'm heading, many caves are around freezing.

I've been through AR, PA, VA and WV... they always seem about the same. maybe I should take a thermometer. But what temperature would be considered cold that would cause batteries to preform at a lesser efficiency.?

[Marduke]

Below ~freezing for alkaline, ~20F for Eneloops, ~ -30F for lithium primary

[jsniffin]

Thanks Marduke. Would NiMHs be in the same category as Eneloops??

[Tenzin Beck]

Thanks Marduke. Would NiMHs be in the same category as Eneloops??

Yes. Eneloops are NiMH.

[Marduke]

Thanks Marduke. Would NiMHs be in the same category as Eneloops??

Mostly. Eneloops have a tweaked chemistry that gives somewhat superior cold performance.

[Tenzin Beck]

Thanks Marduke. Would NiMHs be in the same category as Eneloops??

Mostly. Eneloops have a tweaked chemistry that gives somewhat superior cold performance.

Interesting, I didn't know that eneloops were better when cold. Can you link to tests? How do they compare to rayovac hybrids? (I run duraloops and duracell hybrid re-labels.)