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extra battery in tahoe, do i have it right


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pitdawg47 
Copper - Posts: 72
Copper spacespace
Joined: February 27, 2010
Location: Wisconsin, United States
Posted: March 20, 2010 at 8:43 PM / IP Logged  

Ok i put a extra battery under my hood to help out..    this is how i have it hooked up..

took a red cable ran it to  main battery+ to + on extra battery  -----extra battery - cable is going to chassi..  ive had it hooked like this for 2 years now had no probs .. is it ok>? 

oldspark 
Gold - Posts: 4,913
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Joined: November 03, 2008
Location: Australia
Posted: March 20, 2010 at 10:29 PM / IP Logged  
Batteries shouldn't be paralleled when idle (not in use).
But if they are, join the two matched batteries together.
Take the +12V from one, and the ground from the other.
That helps ensure symmetrical loading and charging.   
But when one battery deteriorates, the downward spiral that destroys both batteries begin (ie, when non-matched batteries - not the same condition, age, temperature, characterisics etc).
pitdawg47 
Copper - Posts: 72
Copper spacespace
Joined: February 27, 2010
Location: Wisconsin, United States
Posted: March 21, 2010 at 12:26 AM / IP Logged  
just so im understadning... so i need to runs a ground from battery to battery aswell as the positive..?? this that what yoru saying?
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: March 21, 2010 at 3:42 AM / IP Logged  
Connect + to + and - to -
The +12V is taken from the + of the one battery.
The gnd connections (to body & engine etc) are take from the - of the other battery.
pitdawg47 
Copper - Posts: 72
Copper spacespace
Joined: February 27, 2010
Location: Wisconsin, United States
Posted: March 21, 2010 at 11:54 AM / IP Logged  
so i have the + to +  and on the second battery i have it grounded to chassi.. Is that ok or do i need to run a neg lead from my stock battery to extra battery?
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: March 21, 2010 at 4:23 PM / IP Logged  
You connect it as I said.
The two interconnects (+ to + & - to -) should be matched (same size & length = same resistance).
There should only be one connection to +12V vehicle wiring and one to gen (from the opposite -ve (not on the same battery) from where the +12V is taken.
Note that this is ONLY intended for permanently paralleled batteries, and it doesn't prevent earlier failure - it merely removes unbalanced loading and charging that results from different electrical paths (but not from the different charge/discharge characteristics of each battery).
The unreliability of a parallel battery is the sum of each unreliability. IE - for matched batteries, the unreliability doubles. (The unreliability being for cell collapse issues.)
If you only connect the batteries when charging, and (say) with ignition on, then the above isn't as critical (assuming each battery has time to recharge).

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