Exide Extreme N70EX v Century Marine Pro 720

Submitted: Wednesday, Jan 30, 2013 at 13:54
ThreadID: 100262 Views:12203 Replies:4 FollowUps:5
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G'Day 4WDers,

I need to replace the auxillary battery in my 4WD Hilux. I'm wanting to choose between the Exide Extreme N70EX and the Century Marine Pro 720.

I intend using this as a backup battery:
- in case the main starting battery dies, so I can start the car if needed
- in case the main deep cycle AGM battery (in a powered battery box) runs flat

The auxillary battery also powers two auxillary plugs in the Hilux, but not the main "cigarette lighter" plug.

I've previously had two Exide Extreme N70EX batteries, with mixed results: one failed within twelve months and was replaced under warranty, the lasted just over 5yrs.

As for the Century Marine Pro 720, well, I've never used one before, but imagine it'd be a good "hybrid" battery and would withstand the rigours of offroad driving.

I can get the Century for only $4 more and it has better specs, but what do others think?

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Reply By: olcoolone - Wednesday, Jan 30, 2013 at 14:30

Wednesday, Jan 30, 2013 at 14:30
So if I read right..... you want to have another aux battery just in case you aux battery goes flat AND in case your starter battery goes flat.....

Firstly..... why can't you use your aux battery you already have fitted to jump start the car if your starter battery goes flat?

Secondly.... why do you need a second aux battery as back up for your first aux battery?

Thirdly.... what happens if your starter and your first and second aux battery goes flat...... are you going to get a third aux battery?

Why not get another AGM battery?

I gave up long ago having a spare for a spare for a spare for a spare just in case.....
AnswerID: 503636

Follow Up By: Monomeeth - Wednesday, Jan 30, 2013 at 15:25

Wednesday, Jan 30, 2013 at 15:25
Um, no, you didn't read right. Or maybe I didn't explain things very well.

Regardless, you didn't answer my question?! :(

By way of further explanation, I have the main starting battery AND an auxiliary battery under the bonnet. I am replacing the auxiliary battery.

The AGM deep cycle battery is in a portable powered battery box which gets used for various activities. It is NOT usually kept in the car.

If we're camping for a few days I am in the habit of running a fridge from the auxiliary battery at night while we're sleeping, but running it from the powered battery box (AGM battery) during the rest of the time. This means when driving away from the campsite during the day the auxiliary battery would get a top up, and at night the AGM battery would get a rest. This setup/process would run the fridge for between 4 & 5 days depending on the circumstances.
FollowupID: 780365

Reply By: Dennis Ellery - Wednesday, Jan 30, 2013 at 17:39

Wednesday, Jan 30, 2013 at 17:39
If you are going to it use for cycling work such as running a fridge – you will get longer life out of the Marine Pro.
I’ve previously been in touch with the Technical Manager at Century regarding its offroad use.
He said “it’s a very tough battery, and has a very good record, warranty and durability wise”.

I've used 2 Century N70ZZ4WD batteries in my troopy for the last 3 years and when they die I shall replace them with the MP20 for both starting and cycle work.
I don't split the batteries and use both in parrallel for starting and cycle work.
AnswerID: 503651

Follow Up By: Dennis Ellery - Wednesday, Jan 30, 2013 at 17:41

Wednesday, Jan 30, 2013 at 17:41
oops that should read MP720
FollowupID: 780375

Follow Up By: Dennis Ellery - Wednesday, Jan 30, 2013 at 23:19

Wednesday, Jan 30, 2013 at 23:19
I should have mentioned - the specs show Amp Hours, Cranking Capacity, and Reserve Capacity of the MP720 is 20 to 25% larger than the Exide
FollowupID: 780426

Reply By: Mark - Wednesday, Jan 30, 2013 at 20:07

Wednesday, Jan 30, 2013 at 20:07
I have an Exide Extreme N70 as an Aux battery to run a 60lt fridge. I noticed on the long weekend that the voltage had dropped to 11.7 volt after 24hrs use so knew it was time for a new one. I always scratch the install the date on the top of the battery when I install them and it was Nov 2004. Not bad service I thought. They have gone up a bit in price though as I only paid $130 for the last one and now they are $200+!! Ah well if I get another 7 or 8 years out of the next one I'll be happy ; )
AnswerID: 503670

Reply By: Member - Phil G (SA) - Wednesday, Jan 30, 2013 at 23:48

Wednesday, Jan 30, 2013 at 23:48
Last week I bought the Century Marine Pro as my aux. battery - $138 from www.batterydiscounters.com.au
2 year warranty for a 100Ah battery is better than any AGM under the bonnet.
AnswerID: 503681

Follow Up By: Dennis Ellery - Thursday, Jan 31, 2013 at 12:20

Thursday, Jan 31, 2013 at 12:20
Phil that’s a very good price – anyway a lot of AGM’s void their warranties when used in the engine bay.
FollowupID: 780445

Follow Up By: Joe A1 - Sunday, Feb 03, 2013 at 01:31

Sunday, Feb 03, 2013 at 01:31
When it comes to any battery under the bonnet or in a hot position AGM batteries don't like it. If you want that deep cycle which is designed to be drained right down then recharged you have to use a lead acid one in that position. They are a little cheaper than the gel or agm. AGM are great for your camper, caravan or to just power a few things on a camp site. If you really want to run a AGM battery which are a better batery by far to lead acid ones you can relocate it to the back or some where under the car. With a AGM you can mount them on their side if you want so you can tuck them in underneath some where. Most lead acid bateries that are normal or deep cycle when they fail it's due to sulfation mostly which literaly in affect cuts the battery in half. You can get desulfation units or a battery chargers eg. I use the Projector model with reconditioning mode and it works well. I had a standard 4x4 battery and after 2.5 years it would go from full charge to 9v in a couple of days. Most of us just recycle it and buy a new one. I reconditioned it with the Projector charger 2 to 3 times over and hey presto it's working fine. Saved myself $150.00 Stats show that 85% of batteries tossed are retieveable. Ok the Projector charger costs around the $300 to $340 mark and $285 with a thrown in light if you know how to wheel and deal. LOL This unit has all the different science's for the different types of batteries out there, lead acid, Gel, Agm, Calcium batteries charge in their own unique ways and on my unit you have 2, 6, 12, 25 amps to charge and the recon mode as well as being a power supply too. Worth every cent. For those who just aren't sure I don't recommend stuff to people unless I've used it and very happy with it's preformance too. I too thought it's a big expence but so glad I bit the bullet and bought one. Great thing to is you can take a invertor genny and the 25amp charger and get yourself out of the bleep and not have to worry about the spare of the spare of the spare.
FollowupID: 780667

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