new d3100 only shows 11.95?

[Lakota 5,000+ posts]

All you have to do is sit something UNDER the battery if you're worried about it. Seriously, people on this forum like to over complicate simple things.

 

[loopkiller 10+ year member]

All you have to do is sit something UNDER the battery if you're worried about it. Seriously, people on this forum like to over complicate simple things.

Yep, like a piece of plastic... //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[Rashaddd 5,000+ posts]

The concrete myth cmes from retards who sat their batts down on concrete for months and then found they were dead when they tried to use them again

guess what geniuses...lead-acid batteries constantly discharge themselves at a relatively high rate, and if they aren't charged, they completely oxidize/crystalize inside and you no longer have a chemical reaction capable of being broken back down into it's original state (recharged)

Setting it down on a frozen lake might help, as it would slow the reaction, if the concrete is cold, it could help too.

 

[Lakota 5,000+ posts]

Yep, like a piece of plastic... //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

Well, if you want to be exact about it, the plastic MUST be blue.

 

[loopkiller 10+ year member]

Well, if you want to be exact about it, the plastic MUST be blue.

//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif Mine was RED!?!?!

 

[audiolife 5,000+ posts]

my plastic has Barney the Dinosour all over it. It scares away the cement discharge monster.

 

[loopkiller 10+ year member]

my plastic has Barney the Dinosour all over it. It scares away the cement discharge monster.

Barney? Seriously? PPffttt!!!

I got the realz yo!

 

[Lil Poot 5,000+ posts]

i searched around on the internet some and found a siite recommending 4 15 minute periods of 100 amp charging with 15 minute cool down periods in between, followed by 24 hours of ~10 amp charge. i did this using jumper cables off my trucks alternator this morning, and have it sitting on 6 amps now, it was showing 75% charge when i left the house, after about 6 or 7 hours of charging. going to take it into autozone tomorrow before work for load testing.

that should only take a few minutes for them to do right?

 

[badvlvo 10+ year member]

You can email mlogan@mechman.com. He can tell you what's going on.

 

[loopkiller 10+ year member]

i searched around on the internet some and found a siite recommending 4 15 minute periods of 100 amp charging with 15 minute cool down periods in between, followed by 24 hours of ~10 amp charge. i did this using jumper cables off my trucks alternator this morning, and have it sitting on 6 amps now, it was showing 75% charge when i left the house, after about 6 or 7 hours of charging. going to take it into autozone tomorrow before work for load testing.
that should only take a few minutes for them to do right?

It will take usually an hour to fully charge the battery. There are parts of the charging process that just take time. You can rapid charge 95% of the battery. The last 5% take the longest.

 

[audiolife 5,000+ posts]

^^That be true. Just like with my dinky agm charger. If I ever killed my battery I would have to charge it on a bigger charger.

 

[Lil Poot 5,000+ posts]

so between 15 minutes on/15 off charges, 4 at a time off my truck at idle, followed by long charges off 6 amps, it should be enough to put a good charge on this, if its still capable of holding one right?

 

[loopkiller 10+ year member]

so between 15 minutes on/15 off charges, 4 at a time off my truck at idle, followed by long charges off 6 amps, it should be enough to put a good charge on this, if its still capable of holding one right?

If all you did was wire it to your vehicle and let the alt charge it for an hour or so, that should be just fine as well. You could even just put a set of jumper cables on it and start the engine. Let it run for an hour or so and you should have a full battery. If not, it is dead.

 

[Gebrochen 10+ year member]

The battery-concrete thing isn't a myth, but it doesn't apply to modern batteries. If you want to read about it, click this search and pick a link or two:

http://www.google.com/search?hl=en&q=battery+concrete+discharge+rubber&btnG=Search

... a clip for the lazy:

Fact or Fiction

Well, is it true? Will a battery be damaged or discharged by letting it sit on concrete? NO!

Why then do so many people believe that concrete is a battery enemy? Years ago, batteries could have been electrically discharged by sitting on a concrete floor. My dad, for instance, owned an automotive shop for many years. In fact, I grew up on a creeper. My dad reminded me time after time, "Set that battery on wood! I know batteries discharge on concrete because I’ve witnessed it!" And he was right at that time.

Historical Basis

You see, the myth that concrete drains batteries does have some historical basis. Many, many years ago, wooden battery cases encased a glass jar with the battery inside. Any moisture on the floor could cause the wood to swell and possibly fracture the glass, causing it to leak. Later came the introduction of the hard rubber cases, which were somewhat porous and had a high-carbon content. An electrical current could be conducted through this container if the moist concrete floor permitted the current to find an electrical ground. The wise advice of the old days to "keep batteries off concrete" has been passed down to us today, but it no longer applies because of the advanced technology of today’s batteries.