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Robert Noel Reddington
Grand Master
Username: bob_uk

Post Number: 901
Registered: 5-2015
Posted on Friday, 25 March, 2016 - 08:42 am:   Edit PostDelete PostView Post/Check IP

A concern that often comes up with old cars is the good old flat battery worry. I have a twitch when it comes to old cars and batteries.

88An obvious solution is to carry a battery booster thingy. Which is normally a lead acid battery in a box with accessories such as a light and compressor even USB charging port.

There are now lithium ion versions available at a similar price (50 to 100 ). These are much smaller and fit into a coat pocket. CCA capacity of 300 amps. In the USA the guys are using them on large V8s. Problem solved. It would fit quite nicely above the battery box behind the carpet. Ready for action should on get caught out.

So why not fit a lithium ion car battery in place of the lead acid one.
Cost is very high. A battery for a 1000 cc motor bike lithium ion is about 350.
The makers of such batteries say that 2000 cycles to deep discharge will leave 80 % capacity. So a 100 ah becomes 80 ah. However car batteries get charged after starting so 5000 cycles is possible. Also because the battery can be discharged deeper than lead acid the ah is double so that 100 ah is the equivalent of a 200 ah lead acid battery.

EVs have a 12v lead acid for lights and things. This is solely due to cost.
Not only is there cost considerations.
The failure rate of lead acid due to manufacturing defects is quite low. Most failures are caused by driver use. Mercedes found that a high percentage of returned batteries were from fully loaded cars where as the more basic models suffered less. 50% of returned batteries were actually ok.
Lithium ion batteries have a higher failure rate some within a year.
A 60 failure is bearable but 1500!
So the lead acid will be around a long time yet.
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Patrick Ryan
Frequent User
Username: patrick_r

Post Number: 67
Registered: 4-2016
Posted on Thursday, 21 April, 2016 - 01:27 pm:   Edit PostDelete PostView Post/Check IP

Bob,
My car had fitted over 5 years ago a Calcium Silver technology Amaron battery.
It has been faultless, and of course is maintenance free.
Here is a link to my battery model.
http://www.federalbatteries.com.au/105D31R/

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