Battery Charging Issue

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Post Options Post Options   Likes (0) Likes(0)   Quote Keith C Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2022 at 2:21pm
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Originally posted by SaltyC SaltyC wrote:

ya just gotta laugh, don't ya?


It is a real pity that the website has descended to what you refer to SaltyC, and we have to sift to find any posts of value (like yours SaltyC).

I could previously learn heaps off fishing.net and this thread has once again provided invaluable learnings around current battery technologies. Thanks SaltyC for taking the effort.

Unfortunately there are now a minority like you who contribute positively to this website. It is so frustrating having to troll through the crrap to get to the valuable stuff.
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Post Options Post Options   Likes (0) Likes(0)   Quote Pcj Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2022 at 4:02pm
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Originally posted by SaltyC SaltyC wrote:

Gel or AGM, yes.

Lithium, opinions vary and dangers abound!

In my opinion, the issue is why the battery is not working. The BMS can disconnect the battery because it detected over voltage or heat, in either case it wouldn't be wise to apply a shock load to the battery by connecting jumper leads and pushing start. Not only does it not fix the reason the BMS disconnected the battery but it can cause a fire and, in the worst case, an explosion.

The other issue is that the load has been disconnected from the charging source by the BMS as well, so when the motor is running again, if it doesn't reconnect successfully then running the charging source with nothing to charge may cause major damage to it! 


Lithiums are used as start batteries for motorbikes and the general recommendation is not to jump start them from another battery.
Thanks Saltyc. I have no idea with these new batteries,so best would to be disconnect gel/agm etc start via flood,disconnect flood and reconnect other style?? wonder how many different types/starter packs coastguard are going to carry.

Think I will stick with the flood.
Amateur's built the ark. Professional built the Titanic
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Post Options Post Options   Likes (0) Likes(0)   Quote Kevin.S Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2022 at 4:38pm
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Originally posted by SaltyC SaltyC wrote:

you may be able to bypass the problem by connecting a 12 volt source to the battery before connecting the charger, another 12 volt battery , positive to positive, and negative to negative, then connect your charger and when thecharger says it is charging disconnect the other battery. Only with a lithium charger though (I see your ctek is a lithium one, but just in case someone else reads this!)


Bloody useful info there Salty, I'll definitely remember this for future reference.  I had a case just a month ago where I had run a car battery right down and my "smart" chargers would not even look at it -this trick may have fooled them into charging it.  In this case it was OK as I got the battery replaced as it was within warranty.  Would this work by connecting one of those booster starter batteries across the terminals while you start charging?
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Post Options Post Options   Likes (0) Likes(0)   Quote kitno Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2022 at 7:06pm
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I've got to admit, I had oven mitts ready to go and the ranch slider wide open while connecting the batteries lol.

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Post Options Post Options   Likes (1) Likes(1)   Quote SaltyC Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2022 at 7:12pm
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Pcj: Gell or AGM - no problem using jumper cables or a jump start pack. I would not recommend disconnecting a battery after starting a motor, it removes the load the alternator or stator/rectifier are trying to charge with usualy dire consequences!

Kevin.S: my post is specifically about Kitno's situation with his Lithium battery and fooling the internal BMS. Where a flooded battery can't be charged you will usually have a fairly fatal issue with the battery. Some chargers won't charge below 10 volts or so and may be fooled by connecting a 12 volt source but again I don't recommend it unless you are certain that the battery has simply been run completely flat by a load being left connected. It isn't dangerous to try buit the likelyhood that you can resurrect a battery that probably has a terminal fault and then rely on it as a start battery is quite low.
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