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Old 01-02-2018, 01:43 PM   #21
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Join Date: Feb 2016
Location: Seattle, Washington
Trailer: 17b - 2017 model
Posts: 334
The main problem with lithium batteries is that they don't like to be in the 100% charged state, which means that if you leave your trailer in the driveway plugged in most of the time then you will degrade them much faster. Ideally, you'd keep lithium batteries at a 50% charge, but 90% would be a good compromise. This is kind of a fiddly solution and to my knowledge it hasn't been automated for trailers, unlike in electric vehicles which have sophisticated computers and sensors to manage this.

I plan to use AGMs once my flooded cells die. AGMs, like other lead acid batteries, love to be charged to 100%, so you can just leave them plugged in or leave them in the sunlight for trailers with solar panels, and they're perfectly happy. This is predicated on you having a smart charger with a lower float voltage, which is what comes with the Escape by default.

There are other benefits to AGMs, but I think the above is the biggest.

The purported benefit of Lithium batteries is that they have more capacity, but that's not really true when you look at energy per unit volume. They do significantly improve on energy per unit weight, but volume is more the limiting factor on current Escapes I think.

TIP: If you want to calculate true energy per unit volume, you need to ignore the "lead acid equivalent" rating that most lithium battery manufacturers seem to attach to their specs. Such a big lie from the industry to make their batteries look better than reality.
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