Lithium Ion Deep Cycle Rechargeables - Source?

bchapman

Active Member
I am looking at a piece of electronics that draws about 3A. So, for safety, I figure I need a 40Ah battery for a 10 hour day of fishing. I want lithium ion for the obvious reasons - with weight and size being my main concerns here, as I'll have to pack it around.

Does anyone have any suggestions on where to source something... at a price that isn't pushing $600-$1,000?

Thanks!
 

Tinker

Coigrich
You don't want lithium ion, you want a lithium iron phosphate (LiFePo4) battery. Same weight advantage, rated for more recharges, a lot less prone to fires and explosions, and less expensive in the Ah range you want.

I'm not sure what you mean by "deep cycle" (I know what deep cycle means with lead acid batteries) since discharging lithium-based batteries down to less than 40% of a full charge dramatically reduces their lifespan.
 

IveofIone

Active Member
Amazon list a Mighty Max LiFeP04 battery rated at 24-35 amp hours for $255. It weighs 4.3# and is pretty tiny. I would think that 2 of those for around $500 would probably be adequate for your needs and keep you well south of the $1,000 cost.

The other alternative is an AGM 35 amp hour model that sells for around $65-about 1/4 of the price but about 6 times the weight at 24#. I use one of these to power a Minn Kota 30# thrust trolling motor on a pram and it last all day the way I use it. You didn't say what you were going to use it for so we are just guessing without more info.

We would all like to have LiFeP04 batts at a much lower price but right now they are priced kinda like color TV's were when they first hit the market.
 

IveofIone

Active Member
I use a lithium Harbor Freight jump starter/power pack:

https://www.harborfreight.com/automotive-motorcycle/battery/lithium-ion-jump-starter-and-power-pack-62749.html

These are only 12 amp hour but they are super small and light. I have two of them but one will last most of a day on my Lowrance color HD finder.
Very good advice, everyone should have some type of this device in their truck at all times just because, an invaluable tool at times. You can start a big diesel truck with one, use it as a flashlight, charge your phone and do a variety of other task and all for under $100. And it fits in the palm of your hand, weighs very little and comes with a variety of cable hookups also.

An even cheaper source of power for on boat electronics is a UB1250 AGM battery of 12v and 5 amp hours. I use these batteries with a Hummingbird color depth finder on my pontoon boat and soon on my new pram. I have never run one down in a single days fishing, usually getting two days per charge. These can be had on Amazon for $15 and weigh just over 3#. I have 4 of these because I use them for different things and they offer a real bang for the buck.

To see how small they are and easy to mount check out the pictures in my thread-"Day 1 of the new pram build" in the watercraft section. They are so small and compact I don't see why anyone uses a bigger battery just for a depth finder. For $45 you can buy a pair and a spare and power a depth finder for a whole week with just a 9# weight penalty. Cheap thrills!
 

Mike Monsos

AKA flyman219
If you didn't need so much juice these Nocqua 10Ah pro kits are very compact and light. I bought a 4.4 Ah kit for my Garmin Striker4. I haven't had a chance to give it the full test, but a youtube test showed the 10Ah unit lasted nearly 40 hours.

Mike
 

bchapman

Active Member
Thanks everyone so far. This is a good site for someone to find out info about something they know very little. The Viking is not what I’m looking for, except now I’m buying one for my car.

Some time on google has shown a lot of options. Lots of pricier US options, and even more China options. Which is intriguing because most of the US options are Chinese made.

I’ve found a bunch of stuff like this: https://www.aliexpress.com/item/Powerful-electric-bike-12v-40ah-lithium-ion-battery-li-ion-12v-battery-pack-bateria-40ah-laptop/32354474843.html?spm=2114.search0104.3.149.7ebe33bejMvqx0&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_10130_10890_10547_319_10546_317_10548_10696_453_10084_454_10083_10618_10139_10307_537_536_10902_10059_10884_10887_321_322_10103,searchweb201603_55,ppcSwitch_0&algo_expid=2be70510-4c1b-43e7-9687-5db019ccb505-24&algo_pvid=2be70510-4c1b-43e7-9687-5db019ccb505&transAbTest=ae803_4

But I’m dubious. I’m thinking that for the price it might be worth taking a flyer.

I’m still looking, but know a little more than I used to.

Cheers!
 

bchapman

Active Member
If you didn't need so much juice these Nocqua 10Ah pro kits are very compact and light. I bought a 4.4 Ah kit for my Garmin Striker4. I haven't had a chance to give it the full test, but a youtube test showed the 10Ah unit lasted nearly 40 hours.

Mike
I’m surprised by this as the base Striker 4 is rated at 1.5 amps. On a 10 Ah battery under continuous use, it should only last under 7 hours.
 

PezVela

Active Member
I checked the Vancouver, WA Harbor Freight and they have 8-9 of the Vikings in stock, and with the 20% off coupon, (get the coupon on line) .. the $60 sounds like a good deal. Think I'll pick one up today for my truck..
Aaaargh...! I got a Viking at HF, but I couldn’t get the 20% off. He told me to read the small print. Still a must have...
 
Last edited:

sportsman

Active Member
Thanks everyone so far. This is a good site for someone to find out info about something they know very little. The Viking is not what I’m looking for, except now I’m buying one for my car.

Some time on google has shown a lot of options. Lots of pricier US options, and even more China options. Which is intriguing because most of the US options are Chinese made.

I’ve found a bunch of stuff like this: https://www.aliexpress.com/item/Powerful-electric-bike-12v-40ah-lithium-ion-battery-li-ion-12v-battery-pack-bateria-40ah-laptop/32354474843.html?spm=2114.search0104.3.149.7ebe33bejMvqx0&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_10130_10890_10547_319_10546_317_10548_10696_453_10084_454_10083_10618_10139_10307_537_536_10902_10059_10884_10887_321_322_10103,searchweb201603_55,ppcSwitch_0&algo_expid=2be70510-4c1b-43e7-9687-5db019ccb505-24&algo_pvid=2be70510-4c1b-43e7-9687-5db019ccb505&transAbTest=ae803_4

But I’m dubious. I’m thinking that for the price it might be worth taking a flyer.

I’m still looking, but know a little more than I used to.

Cheers!
The Viking is cheap insurance...bought mine...different brand...at Tacoma Screw for $100. There are 4 battery manufacturers in the US. Some mfg overseas under different names. If weight savings is critical for you, that battery is only 5lbs. Amazing for a 40 ah battery. I went with a 44 ah AGM for half the price, but it weighs 28 lbs. My bottom line...especially for all batteries...is you get what you pay for.
 

Mike Monsos

AKA flyman219

Jim Darden

Active Member
I am looking at a piece of electronics that draws about 3A. So, for safety, I figure I need a 40Ah battery for a 10 hour day of fishing. I want lithium ion for the obvious reasons - with weight and size being my main concerns here, as I'll have to pack it around.

Does anyone have any suggestions on where to source something... at a price that isn't pushing $600-$1,000?

Thanks!
No, you need a 60 Ah battery, drawing it down to 50% or less will seriously shorten your battery life. It would be a good idea to have a digital readout on your battery so you don't draw it down too low.
 

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