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Battery maintenance reminder


zmk1962
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Hey Raiders 

A reminder.

Since many of us are in lockdown it may be a good time to do some basic battery maintenance: check/top up fluid, remove connections, clean the connections and battery posts with something like steel wool and refit. Smother everything with grease - I prefer Vaseline as it’s cleaner to handle. 
 

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On my last trip I noticed a bit of voltage drop. Just finished maintenance on my 3 batteries and now can see a 0.4V improvement at the helm voltage meter. 

cheers Zoran 

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good idea, although, with mine, I take all batteries out, as i can, and charge them that nigh tor next day and top up charge ready for trip out.

Ive used Vaseline on the terminals on my DIY battery pack for the trolling motor.

 

 

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  • 1 month later...

Thanks - Good reminder Zoran - I’ve had my batteries (4 on my boat) on charge several times “trickling” over, interestingly, even though they haven’t been used for several months now, there hasn’t been much current drop.

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  • 3 months later...

I've been putting my batteries on a low amperage charger and connected to a simple power plug timer (pin type) I charge them for 30 minutes every 24 hours. 30 minutes is the shortest time I can set. Battery voltage when not charging seems to be maintained at 12.4V. Any views on this approach?

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3 hours ago, Itchin'faFishin' said:

I've been putting my batteries on a low amperage charger and connected to a simple power plug timer (pin type) I charge them for 30 minutes every 24 hours. 30 minutes is the shortest time I can set. Battery voltage when not charging seems to be maintained at 12.4V. Any views on this approach?

What type of battery is it?(deep cycle AGM, lead acid, Gel??) & what are you charging it with??

 

Im no 12V guru but I thought it was always ideal to keep a battery at near fully charged which is close to 13V.

 

At 12.4V you are only keeping the battery charged at 75% which imo could reduce its life?

 

If your using a decent smart charger it will just keep & maintain the battery at the optimum float level & in a non sulphating state.

 

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Sorry, my mistake. The holding battery charge is 12.7V, not 12.4. The 12.7V is the holding voltage about 3 hours after the daily top-up charge has been completed.

One battery is a lead acid deep cycle (for the auxiliary items and lighting) Century 12V 102Ah Deep Cycle Flooded Battery(N70T)and the other is a SuperCharge SeaMaster Gold Marine MF(MFM70) lead acid cranking battery used for nothing other than motor cranking. The deep cycle is charged from the cranking battery through a Voltage Sensitive relay. I plug on a Repco 12V 4.3 A battery charger, which has a full charge cut-out, to the cranking battery.

 

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