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New battery


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Thanks...duh, I never thought about the charger. So, the issue is the charge voltage on a "standard" charger would be too high?

I was intending to just add 1 D34M now and replace the other one when it dies a natural death.

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I gotta ditto Waterbuggy on the West Marine web site. It has all the info you will ever need to make the best choice for a battery, charging and wiring. Its worth a look.

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Thanks...duh, I never thought about the charger.  So, the issue is the charge voltage on a "standard" charger would be too high? 

I was intending to just add 1 D34M now and replace the other one when it dies a natural death.

Here's the technical jargon fromm them. I know from the RV sites I hang out on that most home chargers charge at to high a voltage and cook the Optima's.

In regards to letting the old battery die a natural death. Just remember your new battery will only be as strong as the older, weaker one. If you just replaced the old one, no big deal. If it's 3 years old you might consider replacing it.

Battery charger:

13.8 to 15.0 volts, 10 amps maximum, 6-12 hours approximate.

Cyclic Applications:

14.7 volts, no current limit as long as battery temperature remains below 125°F (51.7°C). When current falls below 1 amp, finish with 2 amp constant current for 1 hour for D34M and 3 amp constant current for 1 hour for D31M.

Rapid Recharge:

Maximum voltage 15.6 volts (regulated).

Maximum current: No limit as long as temperature <125°F (51.7°C).

Maximum recharge time: Charge until current drops below 1 amp.

Float charge:

13.2 to 13.8 volts, 1 amp maximum current, time indefinite (at lower voltage).

All limits must be strictly adhered to.

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Get yourself a 3 stage charger that is less than 10 amps. 1st stage is bulk charge to bring battery up to around 80%. 2nd stage slows the current to top off and fully charge battery. 3rd maintains battery full charge.

I use a Guest 2606 which is a 6 amp 3 stage charger.

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