"Courtney Thomas" wrote in message
hlink.net...
Where do you get the flat metal tabs and what kind of solder/gun/etc/ do
you
use, please ?
Thank you,
Courtney
"Gordon Wedman" wrote in message
news:uCzPg.20189$bf5.5278@edtnps90...
"Glenn Ashmore" wrote in message
news:rXiPg.49461$ok5.21130@dukeread01...
I have one of those fancy Maha C777+ chargers that charge, discharge and
monitor mAh in, mAh out, voltage and charging time so I have been
playing
with several different brands of batteries.
I use the Maha Powerex 2500s which are the latest version of the
highest
rated Ni-Mh double A's. Definitely an improvement over a lot of the
older
models. They have a first 24 hour self discharge rate of about 5% but
even Maha says they should not be expected to hold a usable charge
longer
than about 30 days. The Energizer (Sanyo) Ni-Mh double As are among
the
worst loosing up to around 25% in the first day.
One other thing I have found. You can't get a new Ni-Mh to accept a
full
charge until it has been cycled 4 or 5 times. If you charge them then
use
them until the voltage starts to drop and recharge several times you
get
20 to 25% more capacity.
--
Glenn Ashmore
I'm building a 45' cutter in strip/composite. Watch my progress (or
lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com
"Larry" wrote in message
...
"Glenn Ashmore" wrote in news:Q3fPg.49456$ok5.43395
@dukeread01:
Up to 10% in the first 24 hours
and 1 or 2% per day after that
Hmm....I wonder if that is still true on the new Ni-Mh batteries. I
just
turned on a little flashlight I keep in my desk. It's got two Tokima
2200
maH Ni-Mh batteries I can't remember when I charged, but it has to be
8-9
months ago. The bulb, not LED, in the little flashlight is just as
bright
as it ever is. I'm going to leave it on to see how long it will be
until
it's dead. 230maH in the first day? Wow, that's a lot of loss...
These batteries should have self-discharged long ago, by now.
--
There's amazing intelligence in the Universe.
You can tell because none of them ever called Earth.
I have two comments on this discussion:
1. Batteries Plus probably uses crappy Chinese batteries like everyone
else.
If you buy your own batteries from a place like Batteries America you can
get high quality Sanyo batteries and other good makes.
2. I have successfully soldered the flat metal tabs on these batteries
without any problem. I had no trouble getting solder to wet the tabs. I
line up the batteries in the proper series orientation and then bend one
tab
back onto the battery so that the tab from the next battery lies over it.
I
then tin both surfaces and then overlap them. Now applying some heat to
the
outer tab melts the solder on both tabs and connects them. Taping the
batteries together beforehand helps keep things aligned.
Courtenay
Ray and Bob have pretty much answered your questions. You can buy the
batteries with the flat tabs or without from many sources. I've bought them
on eBay (cheap Chinese) and from Batteries America (Sanyo). By electronics
solder from Radio Shack or perhaps order some from the battery source, eg.
Mouser Electronics. I use a 140 watt Weller soldering gun. As Ray and Bob
have said, you want lots of heat so that you do not have to hold the
soldering gun/iron on the tabs for too long. With the soldering gun I can
press the two tinned tabs together, melt the solder in between and then
release the trigger. This lets everything cool down and set while I'm still
pushing it together. You need a clean tip when doing this or you will have
the soldering gun tip soldered to the top tab. Just wipe it clean
beforehand with a rag. If you've not done much soldering before you can
practice on scrap wire.