Batterie Performance

[fudgefudge]

WE are about to buy a 70 AH approx how long will we get from 18 trush

[Buenchico]

Your question doesn't seem to make sense. (18 trush???).

Read the power consumption label on the relevant device. (If there's more than one device simply add all of the power consumption figures together). Make sure that you're reading the figures in amps, not milliamps. (So, if the power consumption is shown as 2500 mA, you need to read that as 2.5A).

Then divide 70 by the total current consumption to calculate how many hours the battery is expected to last for. e.g. if your total current consumption comes to 3.5A, 70 divided by 3.5 gives you 20 hours running time (assuming that the battery is in peak condition and fully charged to start with).

[Graham-W]

You have been given these figures before. https://www.trollingmotors.net/trolling-motor-run-time
For a 70aH battery reduce the figures to 70% of the 100aH battery in the examples.

[bhg481]

And be prepared for it to be useless fairly soon if you constantly run it completely flat.
If you are looking for a battery which you wish to take nearly flat very often you are better off buying a Leisure Battery (ie, caravan type). They are designed for running flat.

[fudgefudge]

i omly wanted to know approx k you than,

[EcclesCake]

Is English your first language? It is very difficult to work out just what you are asking!