[rollei_list] Re: New NiCad cells for Rolleiflex 3001
- From: John Wild <JWild@xxxxxxxxxxxxxxxxxxxxxx>
- To: "rollei_list@xxxxxxxxxxxxx" <rollei_list@xxxxxxxxxxxxx>
- Date: Fri, 13 Aug 2010 15:32:30 +0100
James,
I guess you're talking about the 2000/3000 battery holders and not the
SLX/6000.
I use the higher rated NiCd cells and have no problem. I do have the rapid
charger though. My slow charger has no charge light and I found that if the
holder contacts were oxidised in any, I had no way of checking if it was
charging or not - so 14 hours would be wasted!. I did cut the cable so I
could put an ammeter in-line and also that facilitated using a 12v car
instrument lamp as a discharger. I regularly have to clean the contacts both
on the camera and the battery packs. The contact area is so small, they pit
& oxidise very quickly.
As you say the NiMH require a different charging method. The Rollei pack,
requiring 5 cells, is a PITA because you have to buy 6 cells!
The holders are some form of plastic because they melt! I had one cell that
shorted and glowed red hot melting the end of the holder. I cleaned it up
and other than a slight bulge, is fully operational again. You could try a
PVC hot-gun welder and weld in a fillet to the crack or else a hot-melt glue
gun but I guess epoxy glue would do the trick.
John
On 13/08/2010 15:10, "James Richard Tyrer" <tyrerj@xxxxxxx> wrote:
> The NiCad cells in my battery pack are basically dead. The original
> ones are only 700 mAh but I see that Sanyo also has 1100 mAh. So, I was
> wondering if there was any reason not to use the higher capacity one.
>
> I also noticed that the NiMH cells claim a 2450 mAh rating, but I don't
> know if they could supply enough current for the full discharge cycle.
> I have a holder for 5 AA cells too, that is a bit the worst for wear.
> The latch was sticking so I disassembled that. Slight corrosion and the
> chrome is pealing off the steel piece but that polished off OK. But I
> find that one of the corners is cracked. So, I am wondering if epoxy
> would repair the corner. I don't know what type of plastic this is, but
> it doesn't really seem to be as tough as HP calculators -- glass filled
> polycarbonate.
>
> I tried some Locktite epoxy that said it was made for plastic and it
> didn't stick. Great. :-( I have widened the crack so I can use the
> epoxy as a filler. I was going to try to get some slow set with black
> filler at an auto supply store.
>
> It looks to me that it may have cracked due to the pressure exerted by
> having the batteries in it. I don't suppose that the piece of plastic
> would still be available as a part. So, I was considering if I should
> try to reinforce the corner with some stainless steel. It isn't
> possible to put a fillet of epoxy on the inside because it would
> interfere with the latch.
>
> It is unfortunate that the NiMH batteries require a special charger so
> must be removed for changing.
>
> --
> James Tyrer
>
> Linux (mostly) From Scratch
>
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