Garrett SeaHunter XL500 voltage question

[Unregistered]

Hello all,

I have the SeaHunter with a dead bat pack. I took it out and was about to replace it when I noticed that the pack had 8 cells and the manual said it has "Seven sub-C size NiCad rechargeable" cells. I was going to replace it with an 8 cell NiMh pack I cannibalized from a NOS computer battery pack.

My question is this, Can anybody think of a reason I should not replace the old pack with the new 8 cell NiMh pack? (Other than the need for a different charger)

Is there an older style rechargeable cell that produces less than 1.2v, thereby allowing 8 cells in an 8.4v pack? If so, I might only want to go with 7 NiMh cells to replace it with.

Thanks,
Joe

[Qiaozhi]

Hello all,

I have the SeaHunter with a dead bat pack. I took it out and was about to replace it when I noticed that the pack had 8 cells and the manual said it has "Seven sub-C size NiCad rechargeable" cells. I was going to replace it with an 8 cell NiMh pack I cannibalized from a NOS computer battery pack.

My question is this, Can anybody think of a reason I should not replace the old pack with the new 8 cell NiMh pack? (Other than the need for a different charger)

Is there an older style rechargeable cell that produces less than 1.2v, thereby allowing 8 cells in an 8.4v pack? If so, I might only want to go with 7 NiMh cells to replace it with.

Thanks,
Joe

I seem to remember seeing a dummy battery some years ago, which was basically a short-circuit. You could then use 7 cells plus the dummy. Not sure where you would buy one though, but you can make one from a length of dowel.

[Tim Williams]

In the original pack there was a dummy spacer. I installed 8 NiMh in it and it works very well. I also checked the transistor in the charge circuit and it can handle the NiMh charger. It make a big difference in weight for sure.

Tim

[Unregistered]

Resistor issues

Hello all,

I found the dummy cell, you were right. I was able to recondition the NiCd pack that was in it. I reattached it and turned it on. I get the battery reading on the meter for a second then it switches to normal mode, but nothing works then.

I reopened it and found two resistors with the leads coroded through on the daughter board with the three pots. Does anybody hve a schematic of all the components on that daghter board? I think that when I replace those two resistors I should replace most of the other components on that daughter board since there are several there with corrosion. Oddly enough that board is the only one with corrosion.

Thanks all,
Joe

[Tim Williams]

Look here.

http://thunting.com/geotech/forums/s...ad.php?t=12062

Tim