popotla

Active Member
My Defender Td5 has two original 110 Amp batteries fitted. To the second, a fridge is (normally) permanently connected. Sometimes I run a 1000-W converter, mainly for the laptop. While parked, even for a short time, I switch out the second battery manually.
The first battery died after 4 ½ years from new. The second one, which had been fitted and in use for maybe 3 ½ years, died at very nearly the same time. Thus I fitted two new original 110 Amp batteries. They have been in for exactly three years.
My vehicle stood for a long time through a cold winter and the batteries became flat, I believe. I say “believe” because although at the time I assumed that the engine wouldn’t start because of a flat main battery, there was in fact another problem which prevented starting. (In other words, the batteries may well have been flat, too.)
At present starting is fine and trouble free. (At the moment, the second battery isn’t being used at all, just kept charged through being connected in circuit with the first one while driving.)
I will soon be taking my LR to South America. I expect to be there two or three years, spend long periods in remote areas and perhaps be in cold or very cold conditions. I’m not at ease about the batteries. A flat main battery could be a most undesirable occurrence. I’m going to buy a solar charger and am wondering about carrying a spare new battery. I would secure it very well somewhere on the rear floor (this includes making sure it can’t move in case of an accident, for example, and making sure it can’t tilt) and would cover and insulate the terminals so nothing can cause a short. This way I would have a new battery when either of the others fails, as they will. Is this a bad idea?
 
As I understand one of the main causes of battery failure is contamination at the bottom of the internal plates. The cause, small parts of the plate becoming detached from the plate settling on the bottom of the battery and when sufficient contamination is present the plate’s short circuit giving battery drain/total failure. The main contributor to this is when the vehicle is traveling and the battery is being jolted on lumps and bumps in the road not the battery being used.
I have a couple of batteries which are at least 9 years old; originally they were fitted to vehicles but I removed to fit larger capacity batteries and retained them as standby. They are not fitted to any vehicle but are constantly charged using a solar panel. Using a battery tester they each indicate good useable battery. I use them in the garage as power for 12volt compressor, jump starting if called on to assist anyone and have been used to power lights when the power fails at home.
My point is carrying a spare battery in the vehicle will subject the battery to the same conditions as those mounted and connected to the vehicle electrics so will be susceptible to failure in just the same time span.
I would just purchase the best battery I could get, in the specification I required and forget about carrying a spare.
 
what about the ultima red top or yellow top batteries they are meant to be more resistant to vibration damage.
I agree with Tim4x4 it's pretty pointless carrying a spare battery due to it dieing due to vibration
 
Are you using a deep cycle battery for the fridge or a standard car battery? Your better with a deep cycle for the fridge and a standard one for starting the engine. Also a solar panel on the roof to trickle charge the deep cycle is recommended as well as charging via the vehicle alternator.

That's how most camper and etc are setup as standard car batteries are not really designed for continuous use, they are meant for high electrical demand of short duration, deep cycle are the other way round.

I basically had the same dilemma as you but with a campervan
 
its all pretty much been said, use an optima for the starter battery and a deep cyvle leisure battery for the fridge etc
 
As said above, for the right type of batteries before going, no need to carry extra weigh onsomething you are not using, you might think about carrying a spare chassis in case you get some rot in yours, and an engine? Where would you stop.
You have an idea of how long the batteries you have been using will last therefore if you go for decent new ones with a trial period then the 2 should be good.
 
Newbie observation: Is it worth putting a rubber or foam mat under the battery before clamping it down?
 
there are battery mats available that absorb and acid leaks that stop the metal battery trays getting eaten away. not sure if there are specific vibration damping battery mats but i get what your thinking
 
I wasn't aware of the fact that vibration is a big problem and that for this reason alone, it's not a good idea to carry a spare. Nor did I know that a deep-cycle battery is best for running the fridge, etc.

Both my present batteries are Delphi Freedom YGD 100860 12V 110Ah, no longer available, I understand. The better of these is being used as the starter battery and has been checked as "90 percent good". The other, used for sundry purposes is "60-70 percent good".

I plan to buy one new battery now, use it for the starter battery, and use the present starter battery for the fridge etc. (Yes, deep cycle would be better but at present I don't need to dump both batteries.) I just need to decide on the best battery to buy. (Because of the location and fitting bracket I'm at present using for second battery, one with the same dimensions (app. 33.0 x 17.2 x 21.6 cm. will be good.) I have been researching this. Since opinions differ, perhaps there is no "best". I thought I'd avoid Optima due to reported unreliability.
 
Unless money is tight just get the deep cycle aswell, mine would run just the fridge for days and days before noticeably loosing charge, we also ran lights and and a TV/shower/ water pump off it but obviously that consumed far more current and I would only get 2-3 days before needing a charge (until the solar panel were fitted that is)
 

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