[rollei_list] Re: New NiCad cells for Rolleiflex 3001
- From: Hauke Fath <hauke@xxxxxxxxxxxxxxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 13 Aug 2010 22:51:29 +0200
At 7:10 Uhr -0700 13.8.2010, James Richard Tyrer 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 did the same a few years ago, replacing the original 600 mAh cells with
Sanyo 1100 mAh (KR-1100AA) ones. Worked fine for me. Generally, you pay for
higher cell capacity with less robustness in the face of overcharge, high
current discharge, and an increased self discharge.
>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.
They probably could, but their self discharge rate is way higher than that
of NiCd cells. I thought about using NiMH cells when I rebuilt an SLX
battery, but decided to stick with the original 600 mAh cells since I
hardly ever use the SLX - the cells would have to be recharged before every
use.
>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.
Been there, done that - it can. I used Stabilit Express which is a
two-component epoxy glue with a powdery binding component and a liquid
hardener. It is used in professional setups. I had to re-work the flued
part with a small power drill and ball tool, which worked out nicely.
>I tried some Locktite epoxy that said it was made for plastic and it
>didn't stick.
Well, that's not epoxy, it's cyanacrylate(sp?).
>It is unfortunate that the NiMH batteries require a special charger so
>must be removed for changing.
The quick charger has a plug for 12 V car batteries, which leads to a
resistor setting a charge current of ~ 50 mA. I bridged the resistor, and
plugged in an Ansmann ACS110 electronic charger - works perfectly for both
the 3003 and the SLX battery packs.
At 11:13 Uhr -0500 13.8.2010, Don Williams wrote:
>I would suggest looking at some of the newer chargers, they
>call them "Pulse Chargers" and they are designed to recognize the
>battery type and charge state, and bring them up to a full charge.
That's the type of charger, yes. It adjusts not to cell temperature like
the Rollei quick chargers, since that is too vague, but to characteristic
changes in cell voltage under load.
hauke
--
"It's never straight up and down" (DEVO)
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