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  1. #11

    Default Re: Batteries for Minn Kota trolling motor

    Interesting! I've a lot to learn, but just can't get my head around electrical stuff.....thanks Jim

  2. #12
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    White City, Oregon, USA.
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    Thumbs up Re: Batteries for Minn Kota trolling motor

    For really testing a battery this is THE TOOL you want; actually puts a load on the battery so your not just getting a surface charge reading:

    https://www.walmart.com/ip/Digital-B...1539c15683127c
    Fred Evans - White City, Oregon

  3. #13
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    Default Re: Batteries for Minn Kota trolling motor

    Quote Originally Posted by 11foot5 View Post
    Thanks Jim, maybe I'm too severe on them, but I thought deep cycle went further than 75%.....obviously not. Also, how do you know the amount of discharge? Just guess? The more I read, it looks like two 75ah are the way to go?

    Jim's right. I've even seen it written you shouldn't discharge a lead battery below 50% to get the maximum life out of it.
    You can roughly gauge the remaining charge by taking a voltage reading with a multimeter.
    This chart gives you an idea of what's left in your battery .....

    Scott

    Fly fishing is my prozac

  4. #14

    Default Re: Batteries for Minn Kota trolling motor

    I also recommend the Halford's leisure battery. I have the 115Ah and it comes with a 5-year guarantee.

    My battery is wired into my boat for this season, with the addition of a rectifier installed in my outboard for charging the battery. I'm not in favour of LED indications on battery state. They don't give enough meaningful information IMHO.

    My Water Snake electric has a digital voltmeter to indicate the battery state. It's perfect for my set up. When the outboard is off and the electric isn't running I can see the off load voltage of the battery, which for weeks now has been circa 12.4 volts, then when the outboard is running the voltage reading increases slightly, giving me confidence the charging circuit is working.

    Before I wired the battery to the outboard, I used to run the battery down to about 11 volts, indicated when the electric was running, before I took it home for charging. So far, after about 7 or 8 weeks running, the battery is still more or less fully charged and no more back breaking battery lugging.

  5. #15
    Join Date
    Feb 2018
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    Hampshire, UK
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    Default Re: Batteries for Minn Kota trolling motor

    Quote Originally Posted by seana View Post
    Hi,
    Can anyone recommend a battery to run a 50lb Minn Kota, preferable one that's not to heavy.

    Thanks
    I have been using 'leisure' batteries for a long time for several purposes and Yuasa are the best I have found. You can get lots of cycles from them (they claim up to 160, which doesn't sound a lot but it is far better than most).

    Don't buy a 'car' battery as they are designed to give extremely high current for a short time to work the starter motor but they lose out on everything else.
    Similarly 'marine' batteries which are somewhat of a compromise between car and leisure.

    So go for 'leisure'. They don't mind 'deep discharge' as long as you don't flatten them completely. Yuasa are a bit pricey but not too much. They are all heavy - lead/acid batteries inherently are and leisure batteries contain a lot of lead.

    Lithium-ion. The best of all. About a half (or even less) of the weight of lead acid and you can charge them in a hour. But they must use their own type of (expensive) charger, they will catch fire, sometimes violently, if you try and use a lead acid charger. Very expensive but prices are coming down. Never store big ones in your house.
    Last edited by Mark Powell; 17-05-2018 at 09:50 AM.

  6. #16

    Default Re: Batteries for Minn Kota trolling motor

    I've been using a marine battery, interesting to read the last post stating they are sort of mid way between car and leisure? Just been to Halfords, got a 115Ah leisure battery......the journey continues! By the way, they state it's guaranteed for 2 years....obviously conditional on treatment and number of cycles?

  7. #17
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    Default Re: Batteries for Minn Kota trolling motor

    Quote Originally Posted by 11foot5 View Post
    I've been using a marine battery, interesting to read the last post stating they are sort of mid way between car and leisure? Just been to Halfords, got a 115Ah leisure battery......the journey continues! By the way, they state it's guaranteed for 2 years....obviously conditional on treatment and number of cycles?
    The marine ones are a compromise because they are able to supply a short term high current for a boat starter motor. But you don't usually start a boat engine as often as you start a car so the battery doesn't have to 'recover' so quickly. A car battery uses lots of very thin plates to give a large plate area, a leisure battery uses a few thick ones as it is not required to supply a starter motor, and a marine battery is somewhere in between.

    Halfords are not 'branded' batteries - you don't know who makes them. Not that it matters, most batteries, except the more expensive ones like Yuasa, are much the same.

    Re the guarantee, they have no way of telling how many cycles, and if it is a sealed battery that doesn't need topping up with distilled (or de-ionised) water it's not easy to tell how you have treated it.

    I've noticed that the higher price the longer the guarantee usually is, and with a long guarantee it tends to become 'partial' after the first two or three years so you have to pay some of the replacement cost.

    Being a lifelong cynic I suspect that they are all the same inside and the higher initial price you pay is to recover their percentage of the replacement cost. So if it only lasts three years they don't lose out, and if it actually lasts the claimed four or five it's all profit
    Last edited by Mark Powell; 17-05-2018 at 02:17 PM.

  8. #18

    Default Re: Batteries for Minn Kota trolling motor

    Quote Originally Posted by Mark Powell View Post
    The marine ones are a compromise because they are able to supply a short term high current for a boat starter motor. But you don't usually start a boat engine as often as you start a car. A car battery uses lots of very thin plates to give a large plate area, , a leisure battery uses a few thick ones as it is not required to supply a starter motor, and a marine battery is somewhere in between.

    Halfords are not 'branded' batteries - you don't know who makes them. Not that it matters, most batteries, except the more expensive ones like Yuasa, are much the same.

    Re the guarantee, they have no way of telling how many cycles, and if it is a sealed battery that doesn't need topping up with distilled (or de-ionised) water it's not easy to tell how you have treated it.

    I've noticed that the higher price the longer the guarantee usually is, and with a long guarantee it tends to become 'partial' after the first two or three years so you have to pay some of the replacement cost.

    Being a lifelong cynic I suspect that they are all the same inside and the higher initial price you pay is to recover their percentage of the replacement cost. So if it only lasts three years they don't lose out, and if it actually lasts the claimed four or five it's all profit
    I suspect Halford's are made by Bosch - a pal of mine has a Bosch and the only difference from my Halford's is the colour, the Bosch having a white case. They weigh the same - a blummin' ton!

    They are certainly not all the same. I used to use cheap brands such as 'UK Giant' and 'Numax', and never got more than about a season and a half out of any of them. You can tell the difference if you lift one in each hand - the Bosch/Halford's ones have way more lead in them! My first Halford's 115 AH lasted a full 5 seasons, and I 'retired' it before it let me down. However, the next Halford's I got started this year going into its 3rd season, and it failed to last the day a month or so back - unheard of for a Halford's 115 AH! It was still just within the 2 year guarantee, so I took it back and they replaced it with a new one - no questions, no quibbles. I noted the guarantee doesn't renew with the replacement - oh well...

    Interestingly, a new type of car battery has appeared on the scene - ones designed for modern cars with stop-start technology - I have one in my Yeti.

    Col
    Please note that any views expressed in this post may be those of the
    originator and do not necessarily reflect those of the reader.

  9. #19
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    Default Re: Batteries for Minn Kota trolling motor

    Quote Originally Posted by Mark Powell View Post
    Lithium-ion. The best of all. About a half (or even less) of the weight of lead acid and you can charge them in a hour. But they must use their own type of (expensive) charger, they will catch fire, sometimes violently, if you try and use a lead acid charger. Very expensive but prices are coming down. Never store big ones in your house.
    There is another lithium option, aside from the expensive purpose built batteries.
    Lipo, more commonly used with drones and electric bikes.
    Myself and another guy on the forum (Phil) have been using these for a couple of seasons now and they’re proving to be a great alternative to heavy lead acid batteries.
    There’s another thread about this but I’m damned if I can find it at the moment.
    Scott

    Fly fishing is my prozac

  10. #20
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    Default Re: Batteries for Minn Kota trolling motor

    Quote Originally Posted by scobo View Post
    There is another lithium option, aside from the expensive purpose built batteries.
    Lipo, more commonly used with drones and electric bikes.
    Myself and another guy on the forum (Phil) have been using these for a couple of seasons now and they’re proving to be a great alternative to heavy lead acid batteries.
    There’s another thread about this but I’m damned if I can find it at the moment.
    Electric boat motor

    Best regards
    Jim
    The fishing has been so hard lately, that even the liars aren't catching anything

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