wrong MX5 Battery from Battery World? (acid based?)

[Benny]

Personally, I'll stick to the standard battery.
I know of many that have lasted 15 years!

My SP is now over 6 years old, and still has the oringinal battery.
It's parked outside every night, with the alarm on, and I have flattened the battery a few times, and after a clutch start, it has always re-charged quickly and has lasted and performed very well.

[wun911]

Weight of stock panasonic battery fron NB8B is 9.514 kg
Dimensions of stock panasonic battery (cm) is W12.5 H16.0 L 23.5

I got an odosy battery havent had it long so I cant say how long it will last but its smaller so I kinda expect a short life compared to oem.
old panasonic is now 9 years old was still good when i replaced it with odosy to save weight...

If anyone wants a GB on a porsche battery Im in

[TieNN89]

If anyone wants a GB on a porsche battery Im in

you really are a worry

[xen]

Any other suggestions on this or just have to go original battery?

I just bought my car, and it failed the rego inspection for having the wrong battery type. It has one that needs to be topped up with water.
Went to supercheap and autobarn they had no idea what I meant when I said I needed a battery for the boot. Century lists a normal battery as the correct battery for a NB MX-5.

[93_Clubman]

Any other suggestions on this or just have to go original battery?

I just bought my car, and it failed the rego inspection for having the wrong battery type. It has one that needs to be topped up with water.
Went to supercheap and autobarn they had no idea what I meant when I said I needed a battery for the boot. Century lists a normal battery as the correct battery for a NB MX-5.

try the battery factory 141 newcastle st fyshwick (02 6280 6511) - that's where I bought my last mx5 battery, an ac delco (or Delkor 22NF-330D), back in '02. it was slightly taller & so needed a longer securing rod which i already happened to have. you need a battery that's sealed apart from two vent tubes which the two into one rubber pipe in your boot fits to allowing fumes to vent outside through the boot floor hole. alternatively you can go for one of the fully sealed type batteries, but they are more expensive - depends on your requirements & constraints.

[mx52nv]

Confession: I made the mistake of letting the bozo at the battery shop talk me into buying a federal. Now I know why this was a mistake:

1) It's a crappy old lead acid battery so it will only last 3-4 years vs my 2 Mazda batteries both lasted 8 years!
2) The battery tray is now badly rusted after 1 year.
3) Potential safety issue with battery fumes in the boot.
4) Who cares if it's got more amps? The mazda batteries never had a problem starting the car so who needs more amps.

I'm off to the shop to get a sealed AGM type battery like the original.

Hi there cruiser,
I think you might have bought the wrong Federal battery?
It needs to be model no. 8AMUIR which looks like this (stolen from Mania's website ):

Vents for OEM tubes can be connected too.
Regards,
Les

[ma64rk]

a calcium battery or gel battery is highly recommended for NA/NB MX5's, due to the fact it's mounted in the boot, i'd say you'd be better to change it over, sounds like it has a normal acid battery in it, which is probably venting nasty gases into the boot space & the potential to leak acid as well, giving you rust problems

Aj, is a calcium battery a viable option? Do they not vent gasses? I'm looking at this as a replacement to the OEM from my 2001 that has finally passed away:
SuperCharge Gold MF40B20DF
The SuperCharge Gold battery continues to lead in performance and quality. The Gold is powered by Expanded Calcium Grid Technology (EXG) delivering more power and longer useful life compared to a conventional battery. With superior technology, the Gold boasts of exceptional cranking & reserve capacity, proven product reliability and the longest warranty coverage in the market today - as much as 36 Month Warranty!

Anyone know the pro's and con's?
What's an oem battery worth?

Interested to hear thoughts and opinions...

[93_Clubman]

A battery venting gas in itself isn't the problem - the problem is when those gases are not vented outside the boot, which is not the case with the MX5's OEM Panasonic battery. It's a so called sealed battery, but not fully sealed as it has a vent tube either side at the top to which a two into one pipe attaches, which then vents through the boot floor.

The best replacement battery is a fairly regular topic to which, like many questions, there is no definitive answer - it depends on the users requirements, constraints & their philosophical approach. If you've not already seen these not too old posts then they'd be worth a look as they should answer your questions:
viewtopic.php?f=18&t=25325&hilit=battery
viewtopic.php?f=18&t=39216&hilit=battery
viewtopic.php?f=55&t=28764&hilit=battery

[bigdog]

My Supercharge MF43 is now 4 years old and working just fine. Calcium batteries are a 'Low Gas' design, so they don't require vent tubes. $90 for more than 4 years service is a definite win in my book.

[93_Clubman]

BD, from what I've read the Supercharge battery would be my next choice in a battery purchase, which hopefully isn't any time soon. I've only had to buy one battery since early '91 when I bought my '89 NA6. Its original Panasonic battery lasted until '03 when I replaced it with the appropriate AC Delco (aka Delkor) battery which cost about $100. Sold the NA6 the following year when I bought the Clubman, which is on its 2nd Panasonic, the 1st being replaced by the original owner in '00. While the early Panasonics were known to last well over 10 years, I'm not sure the later Panasonics have had the same longevity to make them cost effective against the Supercharge, given the former's cost of $350 approx.