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This couldn't be as simple as a diode between the external positive
contact and the battery packs positive terminal and perhaps a thermal
fuse against the battery pack in case of overcharging?
Andrew.
On Wed, 05 Oct 2005 05:43:08 GMT, (Rubicon) wrote:
>Hello,
>
>I read in a previous post about the induction method of charging an
>electric toothbrush.
>
>In my wanderings around the net I've seen a series of commercial
>marine fishing devices that report the depth and spread of their nets
>to the ships. These devices have two stainless contacts on their
>exterior for re-charging their batteries in a cradle. It'm wondering
>how these re-charging contacts work, especially when they're in salt
>water and does anyone have a circuit. My reason is that I'm thinking
>of putting together a "Kontiki", a floating battery powered torpedo
>shaped fishing device that takes a line out past the breakers. The
>prop is either at the rear or under its front for better
>self-correction and it's on a timer. As they're battery powered
>(sealed lead acid or ni-cad pack) it'd be good to be able to re-charge
>it without having to be constantly opening and closing it. As I write
>this it occurs to me that an overcharge would possibly cause the
>batteries to vent and build up pressure and fumes inside the
>watertight casing. I understand that sealed lead acid batteries and
>saltwater don't mix (chlorine gas) but it they seem to be in regular
>use as a power source.
>
>Any help here is greatly appreciated as I'd really like to know just
>how they accomplish this.
>
>Cheers,
>
>Andrew.
>
>
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