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Thread started 25 Mar 2012 (Sunday) 22:58
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Bought 20 Eneloop AAs + charger: do I need a better charger?

 
Sunthing ­ Productions
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Mar 25, 2012 22:58 |  #1

I recently bought 20 Eneloop AAs and the Sanyo charger from Amazon. My question is fairly simple: do I need a better charger, like the La Crosse BC-700? The batteries will be used w/ a pair of 430EX IIs, a flashlight and a few other small items. I'm not sure if a smart charger would benefit me compared to the Sanyo.

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J0eybb
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Mar 25, 2012 23:06 |  #2

I use a La Crosse. I would thing the Sanyo,"is good enough"

Here is thread on AA Chargers. https://photography-on-the.net …/showthread.php​?t=1136948 It may prove to be helpful


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theatrus
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Mar 25, 2012 23:07 |  #3

The Sanyo charges just fine, but it is a slow charger.


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Mar 25, 2012 23:16 |  #4

theatrus wrote in post #14153566 (external link)
The Sanyo charges just fine, but it is a slow charger.

Yeah it's a little slow. I got a Powerex MAHA which juices pretty quickly.


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Mar 26, 2012 01:02 |  #5

I say absolutely! Thats not a smart charger with any smart features at all. I highly recommend the Maha C-9000. Get it from Amazon.


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Mar 26, 2012 01:10 |  #6

the sanyo battery charger charges in pairs so that could be a significant issue if you are charging a depleted battery and a battery that is half empty. The sanyo charger recognizes which battery charges first then stops charging.

an smaller less known battery charger that I have found of late is the titanium bay charger

http://www.ebay.com …m53ec242cb4#ht_​3898wt_732 (external link)

@ $12.00 shipped, this is a great deal.

http://www.youtube.com​/watch?v=4LYPKMMquTM (external link)


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Sunthing ­ Productions
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Mar 30, 2012 19:19 |  #7

Thanks for the replies all. I think I'm going to go with either the BC-700 or Maha.


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SkipD
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Mar 30, 2012 19:36 |  #8

Sunthing Productions wrote in post #14183297 (external link)
Thanks for the replies all. I think I'm going to go with either the BC-700 or Maha.

In my opinion (with an extensive electronics background), you'd be better off using the Sanyo charger because going to a rapid charger will run the risk of degrading the batteries much sooner.

Simply do what I did. I have four of the Sanyo chargers so I can charge more batteries at the same time.


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klr.b
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Mar 30, 2012 20:45 |  #9

If you go and buy a smart charger, you can get real crazy and start matching the batteries.


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Mar 31, 2012 10:12 |  #10

SkipD wrote in post #14183367 (external link)
In my opinion (with an extensive electronics background), you'd be better off using the Sanyo charger because going to a rapid charger will run the risk of degrading the batteries much sooner.
.

If a temperature monitor is used NiMH batteries can be charged at rates up to 1C (in other words 100% of the battery capacity in amp-hours for 1.5 hours). At the 1C rate charging is completed 1.5 hrs.

Otherwise C/3.3 charge rate results in full charge in 5 hrs.

The least sophisticated way to safely charge a nickel metal hydride battery is to charge at C/10 rate or below (10% of the rated capacity per hour). So a 2000 mAH battery would be charged at 20 mA for 10 hours.

So when the charger allows a selection of Charge Rate, like 200 or 500 or 700 MA/hr, here is the relative safety...

  • there is risk at the 700 rate unless there is a temperature sensor (2000 MAh / 500MA/hr = 4 hr).
  • At the C/3.3 rate (5 hr.) it is safe if there is a voltage sensor circuit to detect voltage depression; this signal can terminate the charge if the battery under charge is only partially discharged. Measuring -dV/dt is the easiest because it doesn't require a temperature sensor; the best method for NiMH is the dT/dt method but temperature has to be sensed.
  • The C/10 rate does not require an end-of-charge sensor and ensures a full charge with safety.


There are two advantages to a 'smart' charger even if it has marginal sensing for the higher rates...
  • Being able condition the battery by discharging it to a certain level before going into charge mode
  • Being able to charge one cell independently of another cell, so that cells do not have to be charged as a pair, where the more fully charged cell can prematurely stop the charging of the other one, when the first cell reaches full charge and triggers the sensor before the second cell is fully charged


The BC-700 does have temperature sensor in it. The 700 mA rate charges an AA battery in approximately 3.5 hours. It treats cells independently and can even be put in a different mode (charge; discharge; refresh; test) for each one. It can sense defective batteries, and it will not try to charge them

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themadman
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Mar 31, 2012 14:20 |  #11

I use a La Crosse. It allows me to choose lower charge rates which helps with battery life. Also lets me discharge and refresh and other things.


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Bought 20 Eneloop AAs + charger: do I need a better charger?
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