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Re: [OM] T45 battery pack rebuild

Subject: Re: [OM] T45 battery pack rebuild
From: "Bill Pearce" <billcpearce@xxxxxxx>
Date: Thu, 25 Apr 2013 19:08:31 -0500
If there is something like Interstate Batteries in your town, and there is 
usually something like that, you should be able to have a new pack built for 
only a small amount, and they will weld the tabs are required.

-----Original Message----- 
From: Ken Norton
Sent: Thursday, April 25, 2013 5:55 PM
To: Olympus Camera Discussion
Subject: Re: [OM] T45 battery pack rebuild

> Ken, did you succeeded in putting eneloops in the T45?

I've used the NiCDs. The key to this rebuild is that you must use
tab'd cells. So, you will be limited to what you get based on that.

The stock charger is rather dumb and will do a nice job of roasting
the cells if you leave it on the charger too long. I base my charging
on temperature. When I get the temperature shift, I pull it out.

I did a lot of research and navel examination when it came to
replacing the cells. I wanted to use modern high-capacity NiMH cells,
but found out that for this type of application, with a huge current
draw that the T45 demands, you'll actually get about the same
performance out of the 800 mhw NiCD cells as the 2500 mhw NiMH cells.

End result is that I'm still not sure exactly how many flashes I can
get out of a pack. Under normal auto use in average room conditions,
I've gone 300-400 flashes without seeing any slowdown. It sure is nice
being able to do full dumps and have it fully recycled within two
seconds. Actually, you can usually get two full dumps before having to
wait. If I can keep the flash in the 1/4 power area, the flash will
keep pace with the E-1's file-write buffer. At 1/8 power (which is
still pretty powerful), I think I can fire off an entire 36 exposure
roll of film with the MD2 on an OM body.

Based on my research, I don't think the NiMH cells will keep pace like
that and they will deteriorate with hard usage, whereas the NiCD cells
show no degradation from use, only charging abuse. Rule #1 with the
T45 cell: NEVER NEVER NEVER NEVER allow it to drain completely. The
old wives tail about draining your NiCDs are death to these cells.
Within a string of cells (the T45 has five), you'll get some which
will go reverse polarity when you drain them too far. When that
happens, little filaments form which internally short out the cells.

--
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
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