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Lithium Trolling Motor Batteries
Posted on 3/21/18 at 9:41 am
Posted on 3/21/18 at 9:41 am
Ill be in the market for new trolling motor batteries in about a year or so, and Lithium batteries have sparked my interest. The reason i would like to go lithium is weight reduction. i am currently running 2 everstart group 31's right now, which are about 70lbs a piece, where as Lithium's are about 25 lbs a piece.
From what I have read, Lead acid batteries are only drain to about 50% before voltage drops dramaticly, where as Lithium can drain down to 85-90% before a voltage drop, thus needing less Amp hrs.
They also can come it one 24v battery which is neat.
Anyone have any real world experience with these? How to size them?
***In before they blow up and catch on fire.*** (Lithuim batteries have come a long way from this)
From what I have read, Lead acid batteries are only drain to about 50% before voltage drops dramaticly, where as Lithium can drain down to 85-90% before a voltage drop, thus needing less Amp hrs.
They also can come it one 24v battery which is neat.
Anyone have any real world experience with these? How to size them?
***In before they blow up and catch on fire.*** (Lithuim batteries have come a long way from this)
6
Posted on 3/21/18 at 9:43 am to Elusiveporpi
I have heard you can buy nissan leaf power packs for the about the best bang for your buck to weight savings to amps, but depending on your voltage, you might need a lot of packs
ETA looks like about 16lbs for 110-130 amp hours on 12v
ETA looks like about 16lbs for 110-130 amp hours on 12v
This post was edited on 3/21/18 at 9:49 am
Posted on 3/21/18 at 9:44 am to Elusiveporpi
They are better and lighter, but the price!!!!! Holy moly they don’t give them away.
Posted on 3/21/18 at 9:48 am to Elusiveporpi
I remember looking into them last year when I couldn't seem to keep a flooded battery working.
As I recall the only down side was they were higher than giraffe pussy. If they've come down then I'm sure they'll catch on soon.
As I recall the only down side was they were higher than giraffe pussy. If they've come down then I'm sure they'll catch on soon.
Posted on 3/21/18 at 9:53 am to Elusiveporpi
There are 2 drawbacks to lithium versus all others.
1) The discharge rate is basically flat, you'll go from full power to hammer dead. This is only a drawback if you are one that is accustomed to the drawing down as a warning with classical batteries where you can tell from lack of power to the TM that you need to take it easy because you are close to having dead batteries.
2) the price is still too high, they have come down significantly, but not near enough as a practical option for most of us.
1) The discharge rate is basically flat, you'll go from full power to hammer dead. This is only a drawback if you are one that is accustomed to the drawing down as a warning with classical batteries where you can tell from lack of power to the TM that you need to take it easy because you are close to having dead batteries.
2) the price is still too high, they have come down significantly, but not near enough as a practical option for most of us.
Posted on 3/21/18 at 10:05 am to Dock Holiday
quote:
the price is still too high, they have come down significantly, but not near enough as a practical option for most of us.
You are right on the price, its up there. But, per their marketing scheme, they last twice as long. so you would same some there, but that still leaves you with about a 600$ premium on the batteries.
I do like the idea of getting a battery out of an electric car. ill look into that.
Posted on 3/21/18 at 10:45 am to NYCAuburn
quote:
I have heard you can buy nissan leaf power packs
interested in learning about this
Posted on 3/21/18 at 11:02 am to cajunbuck
I was curious too so I got on ebay.
I'm seeing salvaged ones off wrecked vehicles for $75-100 bucks, with about 35 ah rated per battery. They run at 7.4-8.4 V so you would need two in series (14.8-16.8v). That's a bit high so I'd be leery of using it on an expensive rig, and you probably would be looking at 4 batteries total to get a reasonable Ah number. 24v and I think it would get impractical and (maybe) dangerous, but I am no expert on running dc stuff on higher voltage. My understanding is it's fine within reason as long as the motor stays cool (in water). More sophisticated controls may be voltage sensitive versus your $99 academy special that just clicks 1-5.
I'm seeing salvaged ones off wrecked vehicles for $75-100 bucks, with about 35 ah rated per battery. They run at 7.4-8.4 V so you would need two in series (14.8-16.8v). That's a bit high so I'd be leery of using it on an expensive rig, and you probably would be looking at 4 batteries total to get a reasonable Ah number. 24v and I think it would get impractical and (maybe) dangerous, but I am no expert on running dc stuff on higher voltage. My understanding is it's fine within reason as long as the motor stays cool (in water). More sophisticated controls may be voltage sensitive versus your $99 academy special that just clicks 1-5.
Posted on 3/21/18 at 11:11 am to Elusiveporpi
Lithium batteries blow up and catch on fire.
Posted on 3/21/18 at 11:33 am to GEAUXLPOST
quote:
Lithium batteries blow up and catch on fire.
you cant say that because i already said it in the OP!
Posted on 3/21/18 at 12:16 pm to Elusiveporpi
What about the additional cost of the special charger? You don't want to be charging lithiums with your regular onboard charger.
Posted on 3/21/18 at 12:34 pm to Elusiveporpi
Friend runs one on his race car, $2500 plus several hundred for the special charger it needs. I wouldn't try homebrewing a system with power tool batteries either, li-ion batteries need feedback control circuits (either built into the battery or the device) to control their discharge rate and level as well as maintain cell balance. Just get a good AGM deep cycle battery.
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