lithium batteries

Last year I posted about a small Retailer, Couple, at an RV Rally. They were selling them. One battery would replace four Deep Cycles 6 volts.
there are some running them evidently.

Me Again wrote:

Chuck_thehammer wrote:
and last year they grounded the 777 and 787 aircraft because!!!!!!! smoke...

and Tesla car fires...

and r/c lipo batteries has the came chemistry... a fire is a fire.

You missed Chevy Volt fires. And it is only the 787!

Chris

Thank You for the correction..

I keep forgetting Chevy makes the Volt. or the Volt is a car.

The Tesla car was following a truck that had a piece of angle steel fall off and was projected up into the bottom of the Tesla with a force later calculated of more than 25 tons. The piece of metal pierced the shield around the batteries and pierced multiple batteries which then shorted out. The batteries then caught fire.

Had this happened to a standard car the gas tank would have been punctured and the car could have burst into flames and there would have been no survivors. Electric cars are the safest ones to be in with a crash and have the highest crash ratings of any cars on the road today.

Lithium batteries are expensive but comparatively light and compact for the power they can store. This has value in a jet or an electric care but zero value in an RV. Know of any light RV's? Even if the RV started out as light most are carrying around an extra 1000 lbs. or more of stuff. Saving 40 lbs. with a lithium battery is hardly cost effective.

Flooded and AGM and Gel types of batteries are mass produced by the millions and distributed by the truck load. No way a consumer lithium battery can compete on cost in the volumes they are produced and sold. If your RV has a vented battery compartment the flooded lead acid type are the best batteries to get. You can spend more but you will not get more in doing so.

Chuck_thehammer wrote:
and last year they grounded the 777 and 787 aircraft because!!!!!!! smoke...

and Tesla car fires...

and r/c lipo batteries has the came chemistry... a fire is a fire.

You missed Chevy Volt fires. And it is only the 787!

Chris

and last year they grounded the 777 and 787 aircraft because!!!!!!! smoke...

and Tesla car fires...

and r/c lipo batteries has the came chemistry... a fire is a fire.

folivier wrote:
Lots of misinformation out there about LiFePO4 batteries. That's one of the problems. There are quite a few of live aboard boaters using them for a couple years now and really pleased with them. These are not the cobalt based batteries in the Boeing aircraft that had problems. These are actually newer technology and very safe.
It is possible to put together a LiFePO4 system of comparable AH for about the same cost as AGM batteries.

Please, tell us how we can get Lithium for the price of AGM!

Lots of misinformation out there about LiFePO4 batteries. That's one of the problems. There are quite a few of live aboard boaters using them for a couple years now and really pleased with them. These are not the cobalt based batteries in the Boeing aircraft that had problems. These are actually newer technology and very safe.
It is possible to put together a LiFePO4 system of comparable AH for about the same cost as AGM batteries.

Check out www.technomadia.com/lithium for an RVer that put in a fairly large lithium bank.

I looked into them a couple years ago as another way to save weight, but decided I just didn't want to spent that much money in order to gain ~100 lbs.

Advantages:
- MUCH less weight per AH
- Can be discharged to 20% charge without damaging the battery (meaning that 160 of those 200 AH are actually useful, as opposed to just 100 for a 200 AH lead-acid battery)
- Can be recharged 1000 or more times

Disadvantages:
- Limited maximum current draw (check rating on battery to see if it will work for you)
- Limited maximum charge current (check rating on battery)
- No Paukert Effect - when they're dead, they're really dead
- If discharged to shutoff, must be recharged within a (very) few days or they won't (ever) charge again
- COST!

Me Again wrote:
Might want to call Boeing engineers and get their take on the subject! As Boeing is finding out what all of us RC car, truck and airplane owners have known for a number of years, they need a lot of respect! Then there are the laptop fires also.

http://www.all-battery.com/lifepo4battery.aspx

I transport my LiPo's in an ammo can and charge them in a ceramic lined vault!

Here is why!

LiFe batteries are reported to be much safer.

Chris

there is a difference between the Lipo's in your RC stuff, and the LifePo4's.

Fwiw, I plan on using this BMS when I put my cells in my trailer. It has cell level over and under voltage protection, and will add about $150 to the pack cost. With the high voltage cutoff relay, you can use any old charger that you already have. When any individual cell reaches 3.6v, it kills power to the charger. LifePo4's are actually much easier to manage from a charging point of view than lead acid.

I use their other BMS right now in my car, and have been very happy with it.