SuperCharge Gold battery. Long term review.

[GP]

GT12-35HR is the AGM battery. There's a thread all about it on here somewhere

[hks_kansei]

I was not too concerned about the cost evaluation more about the right choice of battery. The sums do not add up either. If you have a start price of $360 for an agm and brand x say at $120 and being replaced say twice over 8 years then even at that point the agm is probably in front- reason brand X is going up every year and say at an inflation rate of 6% after 4 years it is $151 and after 8 it is $190 total $462. Even at 3% infation the numbers favour the agm.
For someone without the spare initial cash or an owner not intending to keep the car I understand the choice. I think the NC may not have an agm anymore - I would prefer an agm in my boot.

do you really want to get into this?

perhaps I could start by adding yet more variables, think of it like this.

yes, Inflation means the prices may go up (although trends towards overseas labout have seen many prices of goods drop), but also remember that the money you did NOT spend on the AGM will be held in a bank earning interest.


let's do the sums, the current inflation rate is 2.7% (not 6%, where did you pull that from? did you even look it up or just guess?)
http://www.rba.gov.au/ (this is the Reserve Bank's website, at this time 24/3/11 @ 4:51pm)

now, we look at a normal saving account (not a term deposit)
the Commonwealth Bank's Netbank saver has an interest rate of 5.85%
http://www.commbank.com.au/personal/acc ... fault.aspx

so, even though the price of the battery may go up by 2.7% each year, you are earning 5.85% each year by not having spent the money.
the only time this would not be the case is if you keep the money you've saved under the mattress.

so in fact by keeping the cash you are 3.15% better off each year. (Bank interest rate, less Inflation rate = Real Interest rate)


This is simple economics, it's the stuff they teach kids in High School.