Neil benjamin
canada
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Joined: 05/20/2008
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Hi
my stock battery is a interstate start/deep battery about 2 years old
checked it and its in good shape . I would like to add a second battery and the dealership now carries interstate deep cycle . the salesperson told me its better than my original start/deep because its true deep cycle . Can i just add it or do i have to replace my original battery ? I am concerned about charging /discharging
Thanks
2007 jayco 23b
equalizer WDH
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2oldman
Winchester WA
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Joined: 04/15/2001
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It's generally not recommended to mix age/type, but i'm sure it'll work fine.
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BFL13
Victoria, BC
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Joined: 02/15/2006
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Started with two 6s, added two 27DCs ("starting/deep-cycle")for four batteries in series parallel, got another 27DC two years later so went with three 27DCs and two 6s in a bank of 5, then later got four new 6s but still have the newer 27DC from before so sometimes I add that to the four 6s and still get a bank of 5.
In other words, ignore everybody and just do it! 
2003 Chev 2500HD Gas, 2003 Komfort 26FS 5er
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garym114
Bluff Dale, Texas
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Joined: 07/24/2006
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Very unlikely it is a true deep cycle unless it is a 6v golf cart battery.
What is the model number of the battery?
2000 Sea Breeze F53 V10 - CR-V Toad
Some RV batteries live a long and useful life, some are murdered.
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wa8yxm
Wherever I happen to park
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2oldman wrote:It's generally not recommended to mix age/type, but i'm sure it'll work fine.
I will support that advice as well.. The major difference, from your point of view, is that a TRUE DEEP CYCLE (Which some here say do not exist) can survive an "OPPS" better than a starting battery.
What is an Opps? Say voltage less than 10. (For a 12 volt battery) That is a very deep discharge.
NOTE: that even with true deeep cycle, OPPS is not recommended.
Nothin adds excitment like something that is none of your business
Kenwood TS-2000 housed in a 2005 Damon Intruder 377
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the_armadillo
SE Texas
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If you start/charge regularly, you will most likely not have much of an issue. However, during storage different battery types/ages will have different internal resistances and voltages and will discharge each other much quicker than identical batteries or a single battery will. If you isolate the two during storage then you remove this problem but should bring up to full charge individually prior to paralleling again.
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BFL13
Victoria, BC
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The_ armadillo is right on. You can discharge them all as a bank and get Peukert working for you. You can charge them all together while camping doing your 50-90s.
But do their 90-100s at home separately and check each's SG to make sure each gets truly full. After that I don't mind floating them all together to prevent self-discharge, but that depends on how long before the next rrip before they start stratifying at different rates while floating.
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