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I think that's milwaukees response after having to warranty too many. Personally I've used the m18 power source for 2 seasons on my ice55. Just ran it for 42 hrs straight with an 8ah battery, works great for me. Also used it to run fans, lights..
Alternative would be to get one of those 3D printed adapters and a drok stepdown voltage regulator.
This is what I did so my 40V strike master batteries would get used. Its about 16ah at 12v, it gives me 2 trips before I need to charge running a Garmin 93svIts worked now for about a year with no issues, both for ice and salt.
Its pretty easy math to do, but only works with lithium batteries because of their near perfect efficiency (about 95-97%), figure youll get about 80% available Wah with a lead acid SLA. Using a 9ah SLA I would get about 12 hours. That is the benefit of running lithium, along with weight savings.
Ohms law. A battery is rated at what it is tested at.It doesn't matter what type of battery they all calculate the same, efficiency is part of the battery rating.Lead acid, Nimh doesn't matter.A watt is a watt, an amp is an amp and an hour is well an hour.A 9ah SLA @12 volt is 108 Wah. 108Wah divided by 7.15 watt draw is 15.1 hours not 12.5.But your mileage may vary.
No that is not correct, SLA batteries are rated on their whole capacity when charged from 0V to 13V. The available range of use is called the "efficiency" and it is rated at about 80% for SLA on AH and actually less on Wah (I did not remember this part). You get about 80% usable AH energy from the batteries full rated capacity depending on how fast you discharge it (faster = less usable capacity). You will get 80% of 9AH when using a SLA battery, maybe as low as 70% if you use a high current draw like a lton of lights. If you discharge it at about 10ma you'll probably be able to get the full 9AH but that is not practical. That's just how lead acid batteries work, and why everything is going to lithium now.
That is contrary to what most literature on the subject states. I am not going to sit and explain it, but anyone who wants to learn about it can google "sla battery efficiency" and read why they do not give a true amp rating in real world tests. Since you keep repeating "Ohms law". Ohm's law is amps = voltage divided by resistance. Let me know how this has anything to do with SLA battery chemistry not giving the rated capacity.