Re: *ist D battery behavior
Well, there has to be some kind of circuity. If you just connect two battery packs in parallel they tend to discharge each other. As the voltage of one pack goes down it draws current from the other trying to recharge itself, then vis versa. Eventually both packs are dead when the device they are in wasn't even turned on. -- Rob Studdert wrote: On 1 Dec 2003 at 5:12, Herb Chong wrote: the little that seems to say anything implies that it is supposed to draw from both at the same time. Still trying to catch up: The two battery sources are likely isolated by series diodes (configured like a logic OR gate). In that case the body would draw from the battery set from with highest voltage and there shouldn't be a switching transient as the one pack takes over the supply.Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998 -- graywolf http://graywolfphoto.com You might as well accept people as they are, you are not going to be able to change them anyway.
Re: *ist D battery behavior
On 5 Dec 2003 at 21:14, graywolf wrote: Well, there has to be some kind of circuity. If you just connect two battery packs in parallel they tend to discharge each other. As the voltage of one pack goes down it draws current from the other trying to recharge itself, then vis versa. Eventually both packs are dead when the device they are in wasn't even turned on. The two diodes would be the circuit, they behave like water stop-valves so would prevent self discharge of the essentially parallel power sources (plus reverse polarity protection). An additional diode would probably be provided to isolate DC power in too as this would prevent the batteries from being subjected to a charging current. batt 1 ||, +- camera batt 2 ||| | DC pow ||' Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
Re: *ist D battery behavior
On 1 Dec 2003 at 5:12, Herb Chong wrote: the little that seems to say anything implies that it is supposed to draw from both at the same time. Still trying to catch up: The two battery sources are likely isolated by series diodes (configured like a logic OR gate). In that case the body would draw from the battery set from with highest voltage and there shouldn't be a switching transient as the one pack takes over the supply.Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
Re: *ist D battery behavior
Hi Bruce, on 30 Nov 03 you wrote in pentax.list: how this is supposed to work? Does it run off the ones in the body first and then off the grip? It didn't seem to seamlessly switch from one set to the other. The manual says (afair) that it uses the set of batteries that has more energy left. So it could be that the camera uses both sets alternately if you often switch the camera on and off. Cheers, Heiko
Re: *ist D battery behavior
I don't have the grip but my D seems to recharge the batteries when I switch the camera off. (wish) The battery indicator says half full and then full again. Who knows? CW - Original Message - From: Bruce Dayton [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, November 30, 2003 11:29 PM Subject: *ist D battery behavior I have the vertical grip on my *istD with batteries in both the body and the grip. Just now, the camera indicated the batteries were dead. I switched it off and back on and it reported full. I'm guessing that it switched from one set to the other. Anybody have any idea how this is supposed to work? Does it run off the ones in the body first and then off the grip? It didn't seem to seamlessly switch from one set to the other. Anyone with experience with this? Thanks, Bruce --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.544 / Virus Database: 338 - Release Date: 11/28/2003
Re: *ist D battery behavior
Batteries tend to recover a bit between uses. Len --- * There's no place like 127.0.0.1 From: [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: *ist D battery behavior Date: Mon, 1 Dec 2003 06:23:31 -0500 I don't have the grip but my D seems to recharge the batteries when I switch the camera off. (wish) The battery indicator says half full and then full again. Who knows? CW - Original Message - From: Bruce Dayton [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, November 30, 2003 11:29 PM Subject: *ist D battery behavior I have the vertical grip on my *istD with batteries in both the body and the grip. Just now, the camera indicated the batteries were dead. I switched it off and back on and it reported full. I'm guessing that it switched from one set to the other. Anybody have any idea how this is supposed to work? Does it run off the ones in the body first and then off the grip? It didn't seem to seamlessly switch from one set to the other. Anyone with experience with this? Thanks, Bruce --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.544 / Virus Database: 338 - Release Date: 11/28/2003 _ online games and music with a high-speed Internet connection! Prices start at less than $1 a day average. https://broadband.msn.com (Prices may vary by service area.)
Re: *ist D battery behavior
I don't have the grip, but I have noticed that often, while the buffer is writing to the card I get the same indication. Bill - Original Message - From: Bruce Dayton [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, November 30, 2003 11:29 PM Subject: *ist D battery behavior I have the vertical grip on my *istD with batteries in both the body and the grip. Just now, the camera indicated the batteries were dead. I switched it off and back on and it reported full. I'm guessing that it switched from one set to the other. Anybody have any idea how this is supposed to work? Does it run off the ones in the body first and then off the grip? It didn't seem to seamlessly switch from one set to the other. Anyone with experience with this? Thanks, Bruce
Re: *ist D battery behavior
Which would maximize the battery life. Not a bad idea from an engineering standpoint. Not quite so great from the photographers point of view. -- Heiko Hamann wrote: The manual says (afair) that it uses the set of batteries that has more energy left. So it could be that the camera uses both sets alternately if you often switch the camera on and off. -- graywolf http://graywolfphoto.com You might as well accept people as they are, you are not going to be able to change them anyway.
Re: *ist D battery behavior
Hi, Michel Carrère-Gée wrote: Where I can found the grip owner manuaal to download ?? http://www.pentax.com/docstore/index.cfm?show=6 Lists the camera manual but not the grip, yet. Might be worth visiting regularly. mike
Re: *ist D battery behavior
I'll scan it and send it to you if you want. Quoting mike wilson [EMAIL PROTECTED]: Hi, Michel Carrère-Gée wrote: Where I can found the grip owner manuaal to download ?? http://www.pentax.com/docstore/index.cfm?show=6 Lists the camera manual but not the grip, yet. Might be worth visiting regularly. mike - This mail sent through IMP: http://horde.org/imp/
*ist D battery behavior
I have the vertical grip on my *istD with batteries in both the body and the grip. Just now, the camera indicated the batteries were dead. I switched it off and back on and it reported full. I'm guessing that it switched from one set to the other. Anybody have any idea how this is supposed to work? Does it run off the ones in the body first and then off the grip? It didn't seem to seamlessly switch from one set to the other. Anyone with experience with this? Thanks, Bruce
Re: *ist D battery behavior
- Original Message - From: Bruce Dayton Subject: *ist D battery behavior I have the vertical grip on my *istD with batteries in both the body and the grip. Just now, the camera indicated the batteries were dead. I switched it off and back on and it reported full. I'm guessing that it switched from one set to the other. Anybody have any idea how this is supposed to work? Does it run off the ones in the body first and then off the grip? It didn't seem to seamlessly switch from one set to the other. Anyone with experience with this? Mine does that. It doesn't seem to affect operation over much, so I don't worry about it. William Robb
