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Lithium 12v Battery Guide -- Info needed

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11K views 41 replies 21 participants last post by  bob_esper  
#1 ·
I am researching this whole Lithium 12v battery versus standard 12v batteries (including AGM).

Weight savings is a no brainer but where I am stumped is the amp hours.

Lithium batteries seem to be rated the same as lead acid batteries, in amp hours, but how can a 54 amp hour lithium battery last longer than a 100 amp hour lead acid battery when you are talking in terms of loads from things like trolling motors? I know that the math gets quite complex when you are trying to figure out the run time of an electric motor on a deep cycle battery. Typically you are looking at the draw of the motor versus the amp hours of the battery.

Is it because the lead acid battery should never be discharged past 80% but a Lithium battery can be discharged all the way?

The Lithium batteries are good for 2,000 cycles which lasts a lot longer than a lead acid battery. The warranties are also much better, some are at 11 years. For the long haul the Lithium are expensive up front but pay for themselves over time. Lithium batteries are supposed to charge faster too.

For those of you with Lithium batteries, what time of run time are you getting on your trolling motor?

What information should a prespective buyer know before changing from lead acid batteries to lithium batteries?
 
#36 ·
@Crc - For commercial-industrial, I provide power-energy solutions for the world (have not deployed in the Antarctic yet), and for this I have different products, as the customer-market has no unified demand (price, cyclic life, warranty, temperature, adaptive monitoring, line loss reduction, large current-power (300+ kWs)). My first lithium solutions was more than 15 years ago, and with time for more asks, I have not seen simplification (and though I have been pushing for some standards on BMS Modbus RTU-485 with limited success). Yes, more people there are more asks and there will be changes and you may have more choice.

For the consumer, I am concern with cheap and unsafe, and we see these in some of the e-bike fires, like the recent ones in NYC and London (King's cross station).
 
#37 ·
As I wrote earlier, I’ve had a good experience so far.

I went with two 100aH 12v for my 24v Terrova primarily for weight savings when I replaced a 153lb two cycle Yamaha with a 254lb Suzuki.

Next time around I’ll be looking primarily at space savings because the 2x 100ah performance is so strong.

Love MarriettaMike’s set up!
 
#39 ·
Here is the reference article I was looking for.

I personally know the author and he is an incredible resource. This is from my sailing days but applies here.
 
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