Re-chargables need a special circuit to charge them properly - something
that gives constant current for Ni-Cads. This circuit will be built into
your phone and torch, so a simple lead is all that's needed. But to charge
batteries on their own needs a charger. However, 30 quid seems a bit
steep. Have a look at Maplin for special offers - I think I saw one on a
*Why are a wise man and a wise guy opposites?
Dave Plowman email@example.com London SW 12
If you use 'AA' batteries then carry spares!
They are dirt cheap, and you can buy them most places as well.
Also - http://www.selectsolar.co.uk/gadget.html solar battery charger for
Also - http://www.picstop.co.uk/pages/products/chargers/chargers.htm 12V
battery charge for under £25 including four batteries.
I am sure you can Google something even cheaper if you try :-)
P.S. you probably pay the money for the charge controller (in the phone IIRC
in your comparison) plus the box and contacts to hold the 4 AA batteries.
The difficulty is working out from adverts etc. which chargers really
are genuinely 'intelligent' and use the correct delta/V detection
circuitry to stop charging when the battery is fully charged.
I believe you can get chargers that work this way for around the £20
to £30 mark now, the chips to make such a charger are certainly
available pretty cheaply so the cost of the hardware should be hardly
any more than for an 'unintelligent' charger.
Does anyone know of any universal chargers (i.e. for AAA, AA, C
and D cells) with delta/V detection at reasonable prices?
Not 'universal' in teh sense that they come with battery boxes etc.
But any decent model electric charger will be adjustable in current and
have full 'delta peak' detection and be able to charge Nicads at least
to within an inch of their life ain about 12 minutes from flat.
NiMh is more tricky - the allowable charge current is much less - at
best half an hour - and the delta peak is very small - less than 100mV -
so you do need to be careful.
I have solved the unuiversaility aspect by replacing in most cases the
battery box, and use standard model packs in the radios etc.
Sadly it doesn't wok for TV remotes etc, but then the batteries wear
ouit so seldom that I don't bother with rechargeables.
Here are a couple that come with a 12V lead...
Dave Cunningham dave at upsilon org uk
PGP KEY ID: 0xA78636DC
Thanks to all who responded. The 7dayshop seems to be the best value. I'll
Th eart of charging small cells is nowhere as danaced as in teh toy
plane and car department.
Visit your local model shop.
Ther are chargers upo to £600 that will charge all sorts of conbiantion
sof cells, simultaneiusly.
A decent FAST charger for running off 12V should be less than £30.
Oh, I'm aware of that. (And I'm presuming that weird word in the middle was
supposed to be "advanced".) Is it fair to say that rapid charge
capabilities are probably of greater importance than charge cycles ?
Your £600 charger might be a little ott for boosting 4xAA cells however ;-)
It's probably more the thing you need when the flight-line director tells
you you have 20mins +/- 2 to get your 72-cell(*) V-bomber ready for
(*) Or whatever. Didn't see many electric behemoths up at Cosford this
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