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You should get more than 7 hours with those, on average you get 1 1/2x the run time over a standard Alkaline. At least that is how they work out on all my machines I use them on.

You do need to sort of keep track because battery indicators are no longer accurate because the LiPo will run at nearly full charge the drop off fast. If I see my indicator down 1 or 2 blocks I recharge them.

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I have just received from Amazon my 4 rechargeable AA Backubes that I will use for my 540

1,5V regulated , 1850mAh capacity which is less than the stock ML NimH  (2500mAh) but still ok for me.

Weight 18grams , much lighter than the ML Nimh ( 28grams ).

Nice product , my rating 8/10 .  I have just to test them on the field but I am sure that they will do the job ... 🙂

 

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