$txt['youtube'] = 'YouTube'; $txt['youtube_invalid'] = '#Invalid YouTube Link#'; Print Page - Battery Maintenance

Improving Your Mokai

Shop Talk => General Tips & Repairs => Topic started by: CC-Coder on March 21, 2019, 12:11:16 PM

Title: Battery Maintenance
Post by: CC-Coder on March 21, 2019, 12:11:16 PM
Probably asked this in the past but should I be doing anything with my batteryís during the winter? Do I need to put them on a charger or is there a battery tester I can buy to check them before heading out each spring? Iím not able to start them once a week since I keep them in the house during the winter.
Title: Re: Battery Maintenance
Post by: Painlesstom on March 21, 2019, 03:02:11 PM
You could put them on a trickle charger, that would be a good idea. Personally I just start mine every few weeks and let it idle for 20 minutes, I know that isn't an option for many though.
Title: Re: Battery Maintenance
Post by: CC-Coder on March 21, 2019, 03:31:28 PM
Would something like this work? Iíve never had the need to take off the tape, so I donít know what the terminals look like?

If this would work, it would keep the GoPro and phone charged at camp, then I could get all those catfish on video. Lol
Title: Re: Battery Maintenance
Post by: Painlesstom on March 21, 2019, 03:46:29 PM
You could clip that on when the boat isn't running, battery has the flat blade type terminals.
Title: Re: Battery Maintenance
Post by: CC-Coder on March 21, 2019, 04:13:44 PM
Thanks Tom. Can you send me an eBay link to a battery tester? I'm curious to see what it would read.
As you know, I didn't have any problem the past 2 years with getting it started...just keeping it running, which had nothing to do with the battery of course. Hee Hee
Title: Re: Battery Maintenance
Post by: Painlesstom on March 21, 2019, 04:23:13 PM
Just use a volt meter, don't need anything fancy. Charged would be more than 12.5v or more. I've had batteries last for 4-5 years before needing to replace.
Title: Re: Battery Maintenance
Post by: CC-Coder on March 21, 2019, 04:42:25 PM
Wish I had the room to store them in the garage but I'd rather not have to scrape my car windshield all winter long. Lol
Don't think I have a voltmeter. I'll take a look on Amazon or eBay. Thanks
Title: Re: Battery Maintenance
Post by: Painlesstom on March 21, 2019, 06:24:27 PM
Here you go.  :)

https://www.ebay.com/itm/7-function-digital-multimeter-battery-tester-meter-voltmeter-voltage-tester-omh/293014304018?epid=1900020443&hash=item4439037512:g:PcIAAOSwQVlcfkv1
Title: Re: Battery Maintenance
Post by: CC-Coder on March 21, 2019, 07:31:54 PM
Order placed, canít wait to see the reading. Guess Iíll have to remove the black tape and retaps when finished l.
Title: Re: Battery Maintenance
Post by: Painlesstom on March 21, 2019, 08:27:59 PM
Yeah the tape is just to keep anything from touching. I usually put a plastic sleeve over them but the extra wiring I did there made it too thick to fit.. so tape was the ticket.
Title: Re: Battery Maintenance
Post by: Jpmichigan on April 24, 2019, 10:04:44 AM
If you haven't moved to the lithium battery yet it is well worth it.   Will save you 9lbs and is super dependable.  mine started up no problem after sitting thru a michigan winter.
Title: Re: Battery Maintenance
Post by: Painlesstom on April 24, 2019, 10:09:19 AM
Good to know. Have a link?  >:D
Title: Re: Battery Maintenance
Post by: CC-Coder on July 26, 2019, 07:16:20 PM
Finally tested my battery after 2 years, guess itís looking like I can go fishing tomorrow?
Title: Re: Battery Maintenance
Post by: Painlesstom on July 26, 2019, 07:42:24 PM
That's a full charge, go catch the big one!  >:D
Title: Re: Battery Maintenance
Post by: happul3 on July 27, 2019, 07:23:29 PM
Finally tested my battery after 2 years, guess itís looking like I can go fishing tomorrow?

Just as Tom stated, it does look exactly like a full charge right after taking battery off trickle charger. However, a completely failed  battery might show exactly the same.  A much better test is battery under load, but that requires more than a multimeter. Easy alternative is to load your battery moderately for a little while and check voltage afterwards. If the voltage drops below 12.2-12.3 V, the battery will likely need to be replaced.

P.S. I realize that "moderately for a short while" is quite vague, but I'd be happy to help with that if need be.
Title: Re: Battery Maintenance
Post by: Painlesstom on July 27, 2019, 07:54:07 PM
Very true. I've moved away from using a trickle charger since it is possible just to give you a false sense of security enough to land you down river, only to hear that dreaded "click click click..............." I was in my jet jon and fortunately had a little 4 stroke backup outboard. Took an hour and a half to go 5 miles up river, but I didn't have to call anyone or paddle. LOL At least in the Mokai you have the pull start as a backup, so it isn't so much a big deal in that case. Just something to think about when it comes to trusting batteries. Not that trickle chargers are bad, just that batteries do go bad and the charger can mask that just enough to get you stuck.  :D

http://www.youtube.com/watch?v=5lScSzZ7_O4
Title: Re: Battery Maintenance
Post by: CC-Coder on July 27, 2019, 10:45:23 PM
Just as Tom stated, it does look exactly like a full charge right after taking battery off trickle charger. However, a completely failed  battery might show exactly the same.  A much better test is battery under load, but that requires more than a multimeter. Easy alternative is to load your battery moderately for a little while and check voltage afterwards. If the voltage drops below 12.2-12.3 V, the battery will likely need to be replaced.

P.S. I realize that "moderately for a short while" is quite vague, but I'd be happy to help with that if need be.

Thanks. Iíd be happy to take you up on your offer, if anything maybe just to learn something new that might save me from paddling a few miles. I better throw my pull start back in my storage and remember to bring my new jump starter too.
Title: Re: Battery Maintenance
Post by: happul3 on July 28, 2019, 12:12:01 AM
Thanks. Iíd be happy to take you up on your offer, if anything maybe just to learn something new that might save me from paddling a few miles. I better throw my pull start back in my storage and remember to bring my new jump starter too.

I'd feel pretty safe with a jump starter onboard. And if you are interested in testing your battery, the simple test is to drain 5-10% of its nominal capacity and check that its voltage is still above 12.5V (which means >75% of capacity).  I am guessing the stock Mokai battery is roughly 5 ah capacity, so you'll want to drain 0.25-0.5 Ah. If you have a 12V->USB charger you could simply charge your cell phone. Assuming 3000 mAh phone battery, you'd want 25-50% increase in phone charge.     
Title: Re: Battery Maintenance
Post by: Painlesstom on July 28, 2019, 08:06:41 AM
Just crank the engine for 30 seconds, that will tell you a lot. An old tired battery won't make it. And the batteries I put in these are 10ah AGM type. Brining your jump starter is always a good idea.
Title: Re: Battery Maintenance
Post by: happul3 on July 28, 2019, 09:17:21 AM
Just crank the engine for 30 seconds, that will tell you a lot. An old tired battery won't make it. And the batteries I put in these are 10ah AGM type. Brining your jump starter is always a good idea.

Good test too. Just be sure to disconnect spark plug lead.
Title: Re: Battery Maintenance
Post by: Painlesstom on July 28, 2019, 06:34:35 PM
Easier just to pull the safety kill switch key.  ;)
Title: Re: Battery Maintenance
Post by: happul3 on July 29, 2019, 08:54:24 AM
Easier just to pull the safety kill switch key.  ;)

I assumed the kill switch disables starter too. If it does not, that's a very neat way to crank engine without starting.
Title: Re: Battery Maintenance
Post by: Painlesstom on July 29, 2019, 09:03:42 AM
Safety kill has nothing to do with the starter, simply grounds the coil like the ignition switch would. You can pull the lanyard key out, or simply hold the button down.
Title: Re: Battery Maintenance
Post by: CC-Coder on July 29, 2019, 11:34:46 AM
Iíll give it a try, probably Thursday after I drop anchor and wait for a bite. 👍🏻
Title: Re: Battery Maintenance
Post by: CC-Coder on August 02, 2019, 06:41:16 PM
Can I use the multimeter to test a 12V Lithium-ion rechargeable battery? If so, is 20 the correct setting and touch leads to battery adapter leads? Also, what reading would show if battery is fully charged?
Title: Re: Battery Maintenance
Post by: Painlesstom on August 02, 2019, 07:17:24 PM
That should be a 3s battery, and at 4.2v per cell you should see 12.6v fully charged. Yes, 20 would be the setting to check DC voltage up to 20 volts.
Title: Re: Battery Maintenance
Post by: CC-Coder on August 02, 2019, 09:54:06 PM
Registered a reading of 11.35 after 3-4 hrs of Humminbird use. At the ratio of Mokai outings to battery charges, should last me a full season on one charge...unfortunately! Just kidding, we'll get out there more in the next few months. Very pleased with the outcome of yesterdays trip. Got 3 decent bites, Nocqua battery lasts awhile, no issues with stalling for the 5th time and tons of wildlife views and a gorgeous day.