arrow 12 with 4300 mah batteries

[oceanobsession]

just tested my home made arrow 12 battery pack. with 4300 mah batteries. i got 100 minutes burn time with hid 100 head. thats 40 minutes more all costing 30 pounds approx. ive remanufactured this identical in every way as orininal how do they justify a cost of 130 pounds

[Adrian Kelland]

Originally Posted by oceanobsession

just tested my home made arrow 12 battery pack. with 4300 mah batteries. i got 100 minutes burn time with hid 100 head. thats 40 minutes more all costing 30 pounds approx. ive remanufactured this identical in every way as orininal how do they justify a cost of 130 pounds

Did you factor in the cost of the time you took to make the battery?

[DIVE BUDDHA]

Originally Posted by oceanobsession

just tested my home made arrow 12 battery pack. with 4300 mah batteries. i got 100 minutes burn time with hid 100 head. thats 40 minutes more all costing 30 pounds approx. ive remanufactured this identical in every way as orininal how do they justify a cost of 130 pounds

hey ocean any chance of sending me some details by pm as i would be intrested to find out some of the finer details i.e suppliers and the like

[oceanobsession]

Originally Posted by Adrian Kelland

Did you factor in the cost of the time you took to make the battery?

1 hour approx

[stevechesh]

Originally Posted by DIVE BUDDHA

hey ocean any chance of sending me some details by pm as i would be intrested to find out some of the finer details i.e suppliers and the like

I made my own up a little while ago. Takes about an hour or so, and is a bit fiddly.

You'll need some 'tagged batteries' like these:

Maplin > Specialist Rechargable Batteries

Some heatshrink like this :

Maplin > heatshrink

and some solder and a soldering iron. You just solder it all up and off you go. You'll also need a long thin strip of conductive metal to go from the bottom battery negative terminal, all the way up to the top battery. Once thats done, slide the batteries inside the heatshrink, get a hot hairdryer and away you go.

It cost me approx £30 and an hour or so to do it. . . . .

[DIVE BUDDHA]

Originally Posted by stevechesh

I made my own up a little while ago. Takes about an hour or so, and is a bit fiddly.

You'll need some 'tagged batteries' like these:

Maplin > Specialist Rechargable Batteries

Some heatshrink like this :

Maplin > heatshrink

and some solder and a soldering iron. You just solder it all up and off you go. You'll also need a long thin strip of conductive metal to go from the bottom battery negative terminal, all the way up to the top battery. Once thats done, slide the batteries inside the heatshrink, get a hot hairdryer and away you go.

It cost me approx £30 and an hour or so to do it. . . . .

i have the arrow 6 but no dought it will be the same principal only fewer batteries!!

maplins main place is 2 miles from me so not far if i need owt like that !

as for heat shrinking i can do that at work !

cheers steve

[stevechesh]

Originally Posted by DIVE BUDDHA

i have the arrow 6 but no dought it will be the same principal only fewer batteries!!

maplins main place is 2 miles from me so not far if i need owt like that !

as for heat shrinking i can do that at work !

cheers steve

Is the arrow six, the smaller black cased battery box? If so, there was definately a thread with piccies where someone had done there own battery pack. I'll see if i can find it....

EDIT: Greenforce Battery Refurb

[Hapless]

That would be me

Its actually an F3. The pack is NiMh rechargeable 12v at 9Ah.

There are 20 GP 18670 (450LAH) 1.2v 4500mAh cells in the pack. They have achieved the 12v using 10 cells in series and the 9 Ah by paralleling two sets of 10.

As you can see from the photos there is a hexagon stack of cells, three high. This uses 18 cells - the other two are in the middle with positive ends at the top and bottom of the pack. Negative from each set of ten is wired from the negative of these middle cells. The positive is bridged off to one of the side stacks where it goes up, down and up again before being wired off the tenth cell in series.

The wires from both 10 cell series are simply joined to a pair of wires that come out of the shrink wrap.

In the end, rather than getting it done commercially, I took a poster's advice and made a spot welder for the nickel tags like this philpem.me.uk :: electronics :: welder

For a few hours of enjoyable messing about I now get over three hours of light sabre action from my Greenforce.

[oceanobsession]

Originally Posted by Hapless

That would be me

Its actually an F3. The pack is NiMh rechargeable 12v at 9Ah.

There are 20 GP 18670 (450LAH) 1.2v 4500mAh cells in the pack. They have achieved the 12v using 10 cells in series and the 9 Ah by paralleling two sets of 10.

As you can see from the photos there is a hexagon stack of cells, three high. This uses 18 cells - the other two are in the middle with positive ends at the top and bottom of the pack. Negative from each set of ten is wired from the negative of these middle cells. The positive is bridged off to one of the side stacks where it goes up, down and up again before being wired off the tenth cell in series.

The wires from both 10 cell series are simply joined to a pair of wires that come out of the shrink wrap.

In the end, rather than getting it done commercially, I took a poster's advice and made a spot welder for the nickel tags like this philpem.me.uk :: electronics :: welder

For a few hours of enjoyable messing about I now get over three hours of light sabre action from my Greenforce.

ive also made the spot welder how does youres work

[Hapless]

Originally Posted by oceanobsession

ive also made the spot welder how does youres work

I used the design from the site I linked.

Basically its a 1 Farad car audio capacitor wired directly to two copper rods. There is a thyristor in the line on the -ve side which is opened by 5v triggered by a foot switch. You put both electrodes on the tag, hit the switch and the contents of cap is dumped through the tips of the rods.

The welds look as good as those on the original Greenforce pack.

BTW - checking back I see you were the "a poster" - thanks for the idea.