Using the Black & Decker BM3B 6V and 12V Battery Charger / Maintainer's

[pbolden]

Hello Everyone,

Anyone have thoughts on using this charger through the boat's DC accessory port to keep both batteries charged over the winter? The Black & Decker BM3B

Amazon.com: Black & Decker BM3B 6V and 12V Battery Charger / Maintainer: Automotive

Thanks,
Paul Bolden

 

[Bob_VT]

Re: Using the Black & Decker BM3B 6V and 12V Battery Charger / Maintainer's

Usually better to charge / maintain two batteries with 2 chargers. I use maintainers/chargers that I got from wallyworld (Schumacher Automotive SpeedCharge Battery Maintainer) that work fine. I have the pigtail connected to the battery and the battery disconnected from everything else.

I like the automatic ones that turn off and when they are on only supply 1.5 amps

 

[pbolden]

Re: Using the Black & Decker BM3B 6V and 12V Battery Charger / Maintainer's

Thanks Bob_VT

 

[UncleWillie]

Re: Using the Black & Decker BM3B 6V and 12V Battery Charger / Maintainer's

There is no issue with charging/maintaining through the DC Accessory Port (Cigarette lighter).

If you have an ACR or the battery switch set to BOTH, It is the same as if you were running the engine and the alternator was charging both batteries in parallel.

The chemistry/physics of the batteries control the amount of charge each one will absorb. Not the charger.
The batteries do not need to be identical or even anywhere near the same for each of them to be properly maintained.

The smart maintainers are extremely gently on batteries.

 

[pbolden]

Re: Using the Black & Decker BM3B 6V and 12V Battery Charger / Maintainer's

Thanks UncleWillie that is EXACTLY the information I was looking for!

Paul Bolden