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Mine Exploration Forum

Author High capacity AA rechargeable batteries?
Vanoord

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Joined: 28/11/2005
Location: North Wales

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High capacity AA rechargeable batteries?
Posted: 27/04/2009 11:47:22
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Having just taken delivery of a Fenix TK40, I find myself in need of some rechargeable AA batteries!

I can get my paws on some 2,700mAh ones quite cheaply, but I think that batteries as high as 3,000mAh are now available.

As far as I can see, the UK supplied 3,000mAh ones work out at pretty mad prices and they're generally either unbranded or are branded with something I've never heard of.

There are some GP Powerbank 3,000mAh ones on eBay, but they're in Hong Kong.

Would I notice any real difference between 2,700mAh and 3,000mAh batteries?

And how reliable are these Hong Kong suppliers on eBay?

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ChrisJC

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Joined: 13/10/2007
Location: Northants

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High capacity AA rechargeable batteries?
Posted: 27/04/2009 13:19:34
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In my humble opinion all you need is batteries with a sufficient capacity to outlast the duration of a trip. Then you can recharge them.

I get caught out far more regularly by the self-discharge of my NiMH cells meaning that I start a trip with reduced charge rather than a freshly charged set running out due to lack of capacity.

Chris.
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mountainpenguin

Joined: 18/12/2006

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High capacity AA rechargeable batteries?
Posted: 27/04/2009 13:41:13
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I have got batteries from:
http://www.component-shop.co.uk/
before. They were good and cheap and the stock is held down the road from me!
IP: 194.74.204.101
Brakeman

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Joined: 10/10/2007
Location: Cheshire

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High capacity AA rechargeable batteries?
Posted: 28/04/2009 13:05:36
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Vanoord wrote:



And how reliable are these Hong Kong suppliers on eBay?


Unbranded ones that I have purchased from HK have been crap, don't bother, even had one catch fire whence charging.

The branded have so far been OK.

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royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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High capacity AA rechargeable batteries?
Posted: 28/04/2009 20:38:05
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I have bought 3000 mAh ones from DX in Hong Kong and they are great especially considering the price of $5.45 US for 2.
Be advised that the voltages can vary a lot on rechargeables, from 1.2 to 1.5 volts off the charger, these are 1.5 volts
Also, be further advised that overcharging, especially to the extent whereby the batteries become hot, causes them to swell so that they are no longer usable in most devices.


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Roy Morton

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Joined: 09/10/2007
Location: Redruth Cornwall

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High capacity AA rechargeable batteries?
Posted: 29/04/2009 03:31:19
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I've put this one up before.
Been using these over a year now and don't seem to have tailed off in performance at all.
The web adress is www.profitexx.de which will take you to the german site. There is a uk ditributor but I can't remember where off-hand.
I paid £11 for eight including p&p. (Ebay)
Saves doing the Hong Kong gamble. Thumb Up



(click image to open full size image in new window)



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IP: 81.153.210.132 Edited: 29/04/2009 03:32:25 by Roy Morton
Mr Mike

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Joined: 09/06/2007
Location: Bury - In The Laboratory

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High capacity AA rechargeable batteries?
Posted: 29/04/2009 07:42:35
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Roy Morton wrote:

There is a uk ditributor but I can't remember where off-hand.
I paid £11 for eight including p&p. (Ebay)


It's Budpak...

[web link]

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Mr Mike
IP: 80.41.67.69 Edited: 29/04/2009 07:43:15 by Mr Mike
emax

Joined: 05/02/2009

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High capacity AA rechargeable batteries?
Posted: 29/04/2009 10:13:43
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2 things to consider. Cheap batteries are likely to have much more variation between cells than good ones.

If you get a good charger like a Maha C-9000 you can accurately test the capacities and "pair" up cells that are closest in capacity for a specific purpose.

Consistency is very important if you intend to use the full capacity of the batteries. If you have one weak cell in that 8 cell torch, it'll start to get reverse-charged by the stronger ones when it runs out. This will damage the cell and further reduce its useful capacity.

If it were me and I'd splashed out on a £130ish torch, I wouldn't be skimping on the batteries ;-)

I highly rate Sanyo Eneloops (available at the component-shop.co.uk). They seem very consistent in terms of capacity when tested on the C-9000 and they don't self-discharge like a lot of the other NimH batteries. They can also deliver very high currents and maintain voltage very well under load, so don't scoff at their seemingly puny 2000 maH capacity rating.

Plenty of runtime graphs/specs/tests on candlepowerforums.com on these.

If you're happy to charge the batteries just before you head out (and self-discharge isn't an issue), I'd look at some quality high capacity cells like the Sony 2700maH or Maha's own brand cells which are also excellent.

Don't believe the capacity printed on the side of the battery with a lot of that Hong Kong/Ebay stuff.

What's your verdict on the TK40 so far anyway?!
IP: 82.70.14.142
SimonRL

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Joined: 27/11/2005
Location: North Wales

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High capacity AA rechargeable batteries?
Posted: 29/04/2009 11:24:41
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emax wrote:

If you get a good charger like a Maha C-9000 you can accurately test the capacities and "pair" up cells that are closest in capacity for a specific purpose.


Ah ha, another Maha user. There had to be another one of us in the UK!

emax wrote:

What's your verdict on the TK40 so far anyway?!


I've seen Vanoord's in use, not got one myself, it's outclassed by the WiseLED (which is four times the price - so it should outclass the TK40!) but the TK40 is very impressive. Not had a chance to do a detailed comparison but it does appear to throw out more light than (ok cheaper) torches that claim more in lumens. I suspect that's down to Fenix's reflector designs.
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Vanoord

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High capacity AA rechargeable batteries?
Posted: 22/09/2009 11:33:34
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Coming back to this after a while...

I notice that 7DayShop now have a pack of 4 2,800mAh AA batteries for £5.39, coming down to £4.99 if you buy 4 packs.

[web link]

Not a bad price imho - I'm tempted to get a couple of packs just as spares.


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