Electronics > Beginners

How to limit the current for hedge trimmer?

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Fliz:
Hi guys
so, here's the situation with which I need a bit help:
I have a accu hedge trimmer but no battery for it, genuine battery was NiCd 24V /1700mAh.



Since I have good amount of laptop Li-ion 18650 batteries I thought to use them and make new battery pack with
6 x 18650 in series which will give me 25.2V max (18V min).

I did that, tried it out and it works but, trimmer doesn't have any electronics inside, just one micro switch rated for
10A and that's it, so I think I can't just connect batteries directly! In my short, couple of seconds testing I measured
consumption and it pulls about 2.6A but is that 2.6A from each of 6 cells (so, total of 15.6A) or is that 2.6A for all 6 cells?
If it's the 15.6A case then I need to limit the current under the 10A, I think that 4A - 6A would be ok?!

What would be the easiest way to do that?

Thanks  :-+

Zero999:
A 5A automotive fuse or pollyswitch will do the job.

Fliz:
So, it is 2.6A in total, that's great.
For recharging I will use Turnigy Accucel-6 hoby charger/balancer but until I buy this balancer I will use Nitecore I4 charger, I will build battery pack that way the 18650 cells could be removed and charged individually.
Also, because this batteries are unprotected (so, no way to stop them discharging under 3V) I bought this:
2-in-1 1~8S Lipo Battery Low Voltage Buzzer Alarm for RC Helicopter


which should help me keep an eye on batteries status. I am still not sure how alarm works on this thing but I hope that it fires of if any of the cells in 6S goes under let say 3V...
Also, idea about 5A automotive fuse is good, very easy to implement :)

I think that this solution should be pretty secure?!

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