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 > Is it OK to mix battery types??

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pianotuna

Regina, SK, Canada

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Posted: 06/28/20 05:43pm Link  |  Quote  |  Print  |  Notify Moderator

Seeing as the "new" battery is a "marine cycle" and not true deep discharge, the "old" diesel battery, while not a perfect match, will work.

In an ideal world all the "house" batteries would be deep cycle, and identical in all possible ways.

* This post was edited 06/29/20 12:45pm by pianotuna *


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

old guy

Oregon (pronounced Or e gun)

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Posted: 06/28/20 08:48pm Link  |  Quote  |  Print  |  Notify Moderator

no any battery person will tell you to use same age and same type batteries on any thing. My brother was a battery store owner and he told me that. I trust what he told me. even if you look up rv education 101 or Dr rv they will tell you the same thing

wa8yxm

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Posted: 06/29/20 05:10am Link  |  Quote  |  Print  |  Notify Moderator

Well there are a few significant differences but not all that significant,.

The Big D'a cranker is a STARTING battery should be kept 80% or fuller State of charge the "Deep Cycle" is most likely a MARINE/deep cycle. note the change of case with a recommendation to keep it over 75% full

True DEEP CYCLE go down to 50 (or less with some of 'em) before serious damage happens,.

Beyond that I've seen all sorts of posts saying "DO NO MIX" Ignore them.
The stronger one will be dragged down by the weaker NO IT WILL NOT
The smaller one will charge faster and tell the converter to stop charging NO IT WILL NOT in fact that is impossible.

One exception and this applies if batteries are mixed or identical IF you have batteries in parallel, mixed or identical matters not. and one gets a SHORTED CELL then it will drag the entire bank down.. But Mixing makes no difference.

NOW: batteries in SERIES (Example 2 GC-2's to make 12 volts) or a 5 Cell Streamlight or maglight flashlight) The batteries need to be matched.. Replace one replace all.

That is where the myths about parallel hookups come from But for parallel they are myths.

ON one more comment
Mixing gc-2 pairs with 12 volt cans.. I do that. no problem
One pair GC-2
One each group 27 29 and 31 all working together flawlessly

(Note I'd have all 31's save the store did not)


Home is where I park it.
Kenwood TS-2000 housed in a 2005 Damon Intruder 377


valhalla360

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Posted: 06/29/20 11:48am Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

Well there are a few significant differences but not all that significant,.

The Big D'a cranker is a STARTING battery should be kept 80% or fuller State of charge the "Deep Cycle" is most likely a MARINE/deep cycle. note the change of case with a recommendation to keep it over 75% full

True DEEP CYCLE go down to 50 (or less with some of 'em) before serious damage happens,.

Beyond that I've seen all sorts of posts saying "DO NO MIX" Ignore them.
The stronger one will be dragged down by the weaker NO IT WILL NOT
The smaller one will charge faster and tell the converter to stop charging NO IT WILL NOT in fact that is impossible.

One exception and this applies if batteries are mixed or identical IF you have batteries in parallel, mixed or identical matters not. and one gets a SHORTED CELL then it will drag the entire bank down.. But Mixing makes no difference.

NOW: batteries in SERIES (Example 2 GC-2's to make 12 volts) or a 5 Cell Streamlight or maglight flashlight) The batteries need to be matched.. Replace one replace all.

That is where the myths about parallel hookups come from But for parallel they are myths.

ON one more comment
Mixing gc-2 pairs with 12 volt cans.. I do that. no problem
One pair GC-2
One each group 27 29 and 31 all working together flawlessly

(Note I'd have all 31's save the store did not)


Lead acid batteries are only happy at 100%...deep cycle simply tolerates deep discharges a bit better. They don't like to sit at 50%.

The rest about myths...simple math...if you parallel the batteries the voltage between the incoming and outgoing cable must be at the same voltage...so the terminals on either side of each battery must have the same voltage...if one battery is running a higher voltage, it will force a current to the lower voltage battery. If it's a small difference, you may not notice it but it will be happening.

If you have batteries of different group but otherwise same design, if they are new, you can probably get away with it because they will be in similar condition and not much difference in input/output voltages.


Tammy & Mike
Ford F250 V10
2008 Copper Canyon 5er
Catalac Catamaran 34'
Full Time spliting time between boat and 5er


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