Hi All, I have a D2 TD5 with a dual batteries but the 2nd battery as D2 owners know only small if install in the engine bay I’m going to install at larger 3rd battery in the rear of the vehicle.
My question is, can you have 2 different amperage deep cycle batteries (i.e. 50amp and 120amp) connected or do you need the same amperage on both deep cycle batteries (i.e. 50amp and 50amp).
Thanks Wade
Swaggie
Certainly; if they are connected together as you would want them to be in a storage battery situation you would then have 170 A/Hr of battery available to run appliances etc.
The only issue with connecting batteries is voltages, IE DON'T connect a 12V to a 6V etc. Different A/Hr ratings or CCA ratings aren't a problem.
JC
Master
SupporterJust my 2 bob worth. If you have a battery in the cab, a fully sealed one like an orbital type is great as there are very little vented gasses and no risk of spillage. If you are going to do this however, I believe 2 will fit in the place of the original starting battery. Not sure on the part about the battery size!
Dave
1974 Military Lightweight Landy --- Some dementia at 50 years old
2000 Disco series 2 now sadly moved on!
No5 Trailer joined the fold... Awaiting graduation to road licensed!
2021 Mazda BT50 or is that DMax?
Thanks for your responds
Wade
Master
G'Day,
Battery suppliers will recomend that you match the type of batteries that are joined in parrell, so if you dual battery under the bonnet is a lead acid wet battery, the other battery in the rear shuld be as well!, but you should not put a lead acid wet battery in the cab as it needs to be vented to the outside due to gases it produces while charging.
Its also suggested that you match the same type of start battery you have (If you have a AGM start batery you shouuld have AGM Dual Batteries) due to the charge curve being different for different styles of batteries. Im not saying mixing and matching wont work but it will work better matched ! The problem with this is buying 2 or more AGM batteries is expenceive to have them all replaced at once.
By the way there is a good spot to put another battery on the D2 TD5, its cradle allready there on the passenger side chassis (under sill area), I think this is for the ACE gear if fitted, This cradle with a bit of re-enforcing and a clamp will fit a 80ah AGM battery on its side and its tucked up above the chassis rail. Can take some pics of mine and give you sizes etc if need be ? As AGM batteries are non-maintance and can be mounted on any side it works well !
Cheers
OldBushie
Hi Jezzel and I wouldn’t take to much notice of what battery suppliers ( sellers ) have to say, most of the time they are just parroting what they have heard and few actually have any real expertise in their trade.
12v lead acid batteries are just that, 12v lead acid batteries.
They can be constructed in different forms, using a myriad of different materials but at the end of the day they are 12v lead acid batteries.
There is a lot of hype about what one type of battery can do better than another type and if someone has a specific reason for using a give battery type then so be it but in the vast majority of RV battery uses, it is not that complex that someone needs specific types of batteries to meet their RV needs.
So there is no reason for using identical batteries and no disadvantage is created when mixing battery types.
Furthermore there are examples where mixed battery set ups can actually be an advantage.
A perfect example is the use of an Optima Yellow Top as the auxiliary battery in Discovery 3s and 4s and RRSs.
This match, combined with my isolators has meant that the cranking battery in these vehicle ( and many other makes ) actually end up with a longer life span.
The reason is that because the Optima can be charged faster than the cranking battery and that Calcium/Calcium batteries are harder to get to a full charged state than most batteries. So when the ignition is turned off, the Optima slowly but constantly discharges back into the cranking battery and over time this raises the cranking battery’s average SoC, helping the cranking battery to gain a battery life expectancy.
So contrary to the unsubstantiated claims of doom if you mix battery types, there is not only no proof to back these claims but the is evidence that mixing battery type can be a benefit.
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