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Old 09 March 2016, 06:59   #1
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Battery Recommendations

I have fitted an Optima BT SLI 4.2 which has a spec of 50AH and a 815CCA. The 140hp Suzuki manual suggests a recommended size of 100AH and 512CCA.

Options

1 Replace like with like? I believe the Optima is a good battery and has worked well for the two seasons that I have used it

2 Replace with a battery such as an Exide EP900 which has a spec of 100AH and 720CCA

3 Replace with a conventional battery rather than gel


Any suggestions appreciated.

Nick
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Old 09 March 2016, 07:16   #2
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I've always used auto batteries and had no problems with them. The Ah rating is purely the battery's capacity so if it's primarily a starting battery and your engine always starts cleanly with little draw from it otherwise, then that rating is largely unimportant. The CCA is important and since you are already exceeding the Suzuki rating you're free to go with whatever you choose.

Plainly, if one day you have difficulty starting the engine, you might wish you'd bought a larger Ah rating.
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Old 09 March 2016, 07:25   #3
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Why are you replacing it?
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Old 09 March 2016, 08:08   #4
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Quote:
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Why are you replacing it?
+1 if it works there is no reason to change it

OPTIMA can works even 5 y so replace it is like throw money to trash I think
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Old 09 March 2016, 08:33   #5
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Quote:
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Why are you replacing it?
Yep beat me to it.......why change??
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Old 09 March 2016, 09:27   #6
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For a cranking battery, forget the Ah rating, it's cca that matters. The Optima will be fine.
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Old 09 March 2016, 10:07   #7
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The only reason for thinking about changing it is I don't know how old it is. I have a full season planned and want to avoid any false starts. I know you can test a battery will that tell you wether it is any good ?

The ideal I guess would be to have dual batteries
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Old 09 March 2016, 10:24   #8
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How often do you change your car battery ?


exactly, only when it starts to fail


IMO, your wasting your money if you routinely change battery and there are no issues with it.
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Old 09 March 2016, 10:58   #9
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I get your idea of proactive maintenance.

If this is the only battery would you consider opting for a dual battery set-up?

A conventional battery, in addition to the gel battery, properly wired with automatic charging relay.
All the "house" loads such as vhf/gps/stereo etc are fed from the second battery, and its there as a backup if the gel battery fails unexpectedly.
Blue Sea do "add a battery" kits (smaller one is for rib/outboard set-ups I believe- choice is based on alternator output).
The cost of this option would be similar to a new gel battery I think.
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Old 09 March 2016, 11:56   #10
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IMO, your wasting your money if you routinely change battery and there are no issues with it.
I do mostly agree (hence my qn above) however, if your car doesn't start it is rarely too serious. That said, even a brand new battery can fail so I'd want an alternative option (rope start? jump start pack?)
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