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Discussion Starter · #1 ·
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Great post. I found this really helpfull. What do you out the battery holder in? Is it true that li-ion battery explode when they get water in them? Someone mentioned it to me and my li-ion batteries for my drills etc have been rained on pleanty and also left out over night in pouring rain and they still work.
 

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Thanks bildad - Interesting.

"I have been using the blue Lithium packs which have worked well, though more recently I have turned to 18650 Lithium Ion cells as they can be used for more applications other than just running a Fish Finder."
I have been using the blue lithium packs for 18 months now, and can't fault them.

I use those 18650's to power a couple of high-powered head torches, and like them too.
http://www.ebay.com.au/sch/i.html?_from=R40&_sacat=0&_nkw=18650+headlamp&_sop=15

Curious as to why you choose to put together a group of 18650's to power your sounder, rather than use the readymade blue pack - given the packs are cheaper, already circuit protected, easy to use (even for us electronics dummies) and come with a charger?

"Is it true that li-ion battery explode when they get water in them?"
Wilson, the "explodo" thing started as a joke, and turned into a Chinese whisper a while back. I think Andrew Johns may have been involved (after a few beers). Keep in mind: your laptop is powered by the same li-ion battery pack. As are most of your power tools, and your shark shield. The li-ions in your VHF, phone and camera are a bit smaller. If you are worried about lithium explosions, charge all in your rechargeable electrical devices in your fire place, or in a fireproof sack. Like all batteries, if you get li-ions wet, they might die.
 

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Discussion Starter · #4 ·
MrX said:
Thanks bildad - Interesting.

Curious as to why you choose to put together a group of 18650's to power your sounder, rather than use the readymade blue pack - given the packs are cheaper, already circuit protected, easy to use (even for us electronics dummies) and come with a charger?
Main reason is that stupid little switch on the side of the pack, My FF Transducer cable and battery is contained in a piece of 90mm PVC Pipe and its a bit of a pain having to turn that switch off when not in use, cos you know that little red LED on the pack well it will run your battery down.
The other reason is I can use the cells for other things like the Dolphin Torch Battery Hack and other applications that don;t require 12V.
viewtopic.php?f=82&t=61300&p=644378#p644378
However for ease as you say I would recommend the Blue battery packs for low consumption electronics.
I am like you I don't know why anybody getting into Yak fishing would use SLA batteries, for the ones that already have SLA batteries I wouldn't change until they died.
I might run some tests seeing if they can handle running bilge pumps and aerators.
 

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Thanks bildad. Correct answer: "I like to play with batteries".

I know what you mean about the on/off switch, with the light. I use a tiny tupperware container with the clip on lid. The charging connection stays inside, power wire through a small hole in the side, with the waterproof connecter glued to the case. Used polymorph to seal the hole, and protect the external wiring. Unit is solid and watertight when clipped closed. I clip it open for switching on/off, and when charging. The red/black wiring is pretty thin inside the cord, so found it needs protecting.

"I don't know why anybody getting into Yak fishing would use SLA batteries"
Finally convinced my dear old mum to replace her 70's cathode ray telly with a modern flat screen. Wore her down from "Bugger off son, the rank arena works fine".

"I might run some tests seeing if they can handle running bilge pumps and aerators."
I found not enough amps for a bilge pump. See no reason why you can't use them on an aerator. The standard old "D" batteries are frustrating. Might have a play with my 18650's on the weekend.
 

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I'm already using those cells for head torch. Have some extras and a good charger. Will grab a couple of those holders I think. Thanks for a really helpful post. :)

edit:
I note my sounders will operate on 10v to 17v dc. If I used 4 of these battries fully charged = 16.8v, giving me I imagine longer run time. Apart from the cost and (neglible) weight and size difference can you see any problem with doing this?
 

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Discussion Starter · #8 ·
spork said:
I'm already using those cells for head torch. Have some extras and a good charger. Will grab a couple of those holders I think. Thanks for a really helpful post. :)

edit:
I note my sounders will operate on 10v to 17v dc. If I used 4 of these battries fully charged = 16.8v, giving me I imagine longer run time. Apart from the cost and (neglible) weight and size difference can you see any problem with doing this?
Yep no problem, you can either get a 4 X holder or use 2of 2 X holder in series back to back, if the shape helps.
The charger mentioned in this thread will balance charge, so if you have any broken Lithium tool batteries lying around, bust them apart and you can use the individual 18650s from them. Just remember they are not circuit protected so if you run them too low they may not recharge again but this charger will safely charge them.
 

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Discussion Starter · #11 ·
Dave73 said:
Ditto all of the above, this system works great.
Bildad helped me out about 12 months ago, thanks again mate. ;-)
Glad it worked out for ya Dave, bloody hell it was a long haul postage wise ay?
 

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Hi Guys,

Inspired by this post I've decided to try lithium ion 18650's instead of SLA to power my Garmin 300c. I pulled the pin on 2x 3400mAh Panasonic 18650 and a Nitecore charger. I was hoping that I'd only need two of these for purposes but am now a little unsure if it'll be the correct/enough voltage to power the 300c. I know little to nothing about amps/watts and all that electrical jazz.

I was looking to get one of these to put them in series: http://www.ebay.com.au/itm/Plastic-Batt ... 4897.l5660

And then looking to get some kind of waterproof box to put it all in. Am I on the right track? Appreciate any help.

I was also wondering if something like this would be an option as it already claims to be waterproof - could something like this be connected to the Garmin 300c?

http://www.alibaba.com/product-detail/S ... 53248.html
 
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