Cobra HH325 Battery Repair

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itsallablur
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Further to Destins post in regards to checking VHF battery. My Cobra HH325 was doing what he described. Fine straight of the charge but after a day's fishing, try to transmit and the battery indicator was flashing.

Marine Deals have them for $80 + postage.

Wondered if I could replace the battery pack with normal NiMH AA batteries?

I'm sure there must be a few of us in the same boat with these units on their way out. Mine must be 5+ years old.

Ripped the cover off the top of the battery and pulled out the battery pack. (1500mAh)
image.jpg
Bought 6 x 2500mAh NiMH Sony rechargables for $30.00 and made my own pack.
image.jpg
All fitted and soldered
image.jpg
Seems to be all go. Just checking it will charge o.k then will cover in sealer to make it all waterproof.

Anyone else that wants to give it a go and has any questions, fire away.
Viking Reload
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Taranaki Kayak Fishing Club link: http://www.oskfc.net
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awondering
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:y: Look forward to the updates mate
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destin
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Nice job :clap:
Ocean Kayak Prowler Ultra 4.3 ZMW9308
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Spikey Dog
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Nice work Alf..
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itsallablur
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Initial charge overnight. 2500mAH / 200mAh charger = 12.5hrs

8.7v off the charger which is roughly 1.45v per battery.

Pretty happy with that, now to make it waterproof. Photo to come.
Viking Reload
Viking GT
Taranaki Kayak Fishing Club link: http://www.oskfc.net
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itsallablur
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All sealed up. Next problem will be once it drys to see if it too big to fit back in radio. Fingers crossed.
image.jpg
image.jpg
Viking Reload
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itsallablur
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She lives again! Will leave it on for the day scanning. Will see how it is holding a charge at the end of the day when transmitting. Seems all good so far.
image.jpg
Viking Reload
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RobEdward
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Good job. Great to see stuff not ending up in the trash. :y:

A word of caution though (you probably already know but for anyone browsing who doesn't) Soldering non tabbed Li ion cells does have risks. You can damage the internal structure of the cells with too much heat which can reduce the capacity of the cell.

Of more worry is the increased risk of fire (my day job is as a firefighter and I've seen a few fires as a consequence of lithium ion battery charging) during charging if the separators inside the cells have been compromised (they're plastic). The general advice for soldering cells is that if you can't solder a wire to a coin that someone else is holding without them dropping it due to heat, you're not skilled enough with soldering to start on cells.

I would recommend you charge that radio in an area that won't compromise the rest of your house if there's a problem. I charge some very large battery packs and I have a shed outside the house that I have set up for that purpose.
•-•---•-•--•-•---•-•--•-•---•-•--•-•---•-•--•-•---•-•--•-•

OK Prowler 4.3
Perception Swing


ZMU 7699
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itsallablur
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Thanks Rob, good advice
Viking Reload
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MadMike
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Very good advice!!!
RobEdward wrote:Good job. Great to see stuff not ending up in the trash. :y:

A word of caution though (you probably already know but for anyone browsing who doesn't) Soldering non tabbed Li ion cells does have risks. You can damage the internal structure of the cells with too much heat which can reduce the capacity of the cell.

Of more worry is the increased risk of fire (my day job is as a firefighter and I've seen a few fires as a consequence of lithium ion battery charging) during charging if the separators inside the cells have been compromised (they're plastic). The general advice for soldering cells is that if you can't solder a wire to a coin that someone else is holding without them dropping it due to heat, you're not skilled enough with soldering to start on cells.

I would recommend you charge that radio in an area that won't compromise the rest of your house if there's a problem. I charge some very large battery packs and I have a shed outside the house that I have set up for that purpose.
Fishing is like a box of chocolates. you never know what is going to be served up...
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itsallablur
Posts: 434
Joined: Mon Jun 01, 2009 8:42 am
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Location: Taranaki

Worked a treat. All day scanning. Transmitted and still showing full bars.

Anyone that wants to do this repair take on board what Rob said re fire. Give it a go if you know how to solder efficiently.

If anyone has one of these in their drawer with a stuffed battery and wants to sell it, let me know or flick a PM as would be good to have one to give when taking newbies out.

Cheers
Viking Reload
Viking GT
Taranaki Kayak Fishing Club link: http://www.oskfc.net
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