Re: [RCSE] New sanyo batteries
Thanks to all that responded to my request for info. I think I'll give them a try in my 9303 and in some planes. -- Jeff Steifel RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] New sanyo batteries
I have charged and discharged the 2000mAh AA Sanyo Eneloop cells at a 2 Amp rate and have come up with great results. Months ago I read a thread on RCG stating that the eneloops could not take high discharge rates. I decided to test it myself with a 4 cell pack I had been using on my full house all digital servo sailplane. I first charged the pack with my Sirius Charge "Limited" Charger hooked up to data logger(The Limited Charges at 2 Amps). The charge curve looked almost identical to a curve made by a NiCd battery indicating that internal resistance is not as high as other NiMh's The charge cycle terminated normally and the pack did not warm up dramatically. I then discharged the pack with a SuperTest Pro at a 2 Amp rate down to 4 volts (1 volt per cell) I still got over 1900 mA out of the pack. I cycled this Eneloop pack repeatedly at 2 Amps and have continued to have good results and will continue to use them in my Full house sailplanes. By the way, I later went back to the RCG thread and found that poor test results reported there were attributed to a loose fitting battery holder. Thanks, John -Original Message- From: Doug McLaren [mailto:[EMAIL PROTECTED] Sent: Sunday, April 06, 2008 9:35 PM To: Jeff Steifel Cc: rcse Subject: Re: [RCSE] New sanyo batteries On Sun, Apr 06, 2008 at 08:45:03PM -0400, Jeff Steifel wrote: > Anyone using the new sanyo eneloop batteries? Yes. The claims about the self discharge rate being extremely slow are completely true. It's extremely nice -- you charge them up, and they *stay charged* even weeks, months later, even in your hot car. > The sanyo site says they have reduced internal resistence, but they > don't give numbers. This I'm not so sure about. This person measured it -- http://www.stefanv.com/electronics/sanyo_eneloop.html and found an internal resistance of about 0.1 ohm/cell, which would be about 4x the value I've read elsewhere for typical AA NiMH cells. I have not measured the internal resistances of any of these cells, so I can't confirm or deny any of these figures. In any event, the Eneloop batteries are great for my flashlights, the digital camera I leave in my car, etc. They'd be great for TXs as well, especially one you don't charge every time you fly. But if the internal resistances that Stefan measured are accurate, they're not going to be very good for RX packs. They might work OK for a few non-digital servos, but I wouldn't use them anywhere that might draw more than an amp or so. Oh, Stefan says this -- This also accounts for the relatively high internal resistance reported by my battery analyzer. The analyzer measures the resistance either immediately, or when the battery first drops below 1.2V per cell. If it had waited until the cells "woke up", it would probably have seen better results. So he doesn't seem to have much faith in his figure either :) -- Doug McLaren, [EMAIL PROTECTED] "Those days are dead and gone and the eulogy was delivered by Perl." --Rob Pike, on one tool for one job RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.22.8/1362 - Release Date: 4/6/2008 11:12 AM mA RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] New sanyo batteries
On Sun, Apr 06, 2008 at 08:45:03PM -0400, Jeff Steifel wrote: > Anyone using the new sanyo eneloop batteries? Yes. The claims about the self discharge rate being extremely slow are completely true. It's extremely nice -- you charge them up, and they *stay charged* even weeks, months later, even in your hot car. > The sanyo site says they have reduced internal resistence, but they > don't give numbers. This I'm not so sure about. This person measured it -- http://www.stefanv.com/electronics/sanyo_eneloop.html and found an internal resistance of about 0.1 ohm/cell, which would be about 4x the value I've read elsewhere for typical AA NiMH cells. I have not measured the internal resistances of any of these cells, so I can't confirm or deny any of these figures. In any event, the Eneloop batteries are great for my flashlights, the digital camera I leave in my car, etc. They'd be great for TXs as well, especially one you don't charge every time you fly. But if the internal resistances that Stefan measured are accurate, they're not going to be very good for RX packs. They might work OK for a few non-digital servos, but I wouldn't use them anywhere that might draw more than an amp or so. Oh, Stefan says this -- This also accounts for the relatively high internal resistance reported by my battery analyzer. The analyzer measures the resistance either immediately, or when the battery first drops below 1.2V per cell. If it had waited until the cells "woke up", it would probably have seen better results. So he doesn't seem to have much faith in his figure either :) -- Doug McLaren, [EMAIL PROTECTED] "Those days are dead and gone and the eulogy was delivered by Perl." --Rob Pike, on one tool for one job RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] New sanyo batteries
I found these links (pdfs) http://www.eneloop.info/uploads/media/Datasheet_-_HR-3UTG_01.pdf http://www.eneloop.info/uploads/media/Datasheet_-_HR-4UTG_01.pdf Quoting David Webb <[EMAIL PROTECTED]>: I have been extensively testing these batteries for over 6 months. They are installed in my TX and RX on my primary and secondary Pike Perfects. The reduced self discharge rate is totally true. My RX packs held 5.75 v for 6 months which is what they were 10 mins afetr the charge was complete. I charge mine using a triton charger at .6-1A. with no heat issues at all. Discharge at .4-.6A takes about 2.5 hours and I have not had a pack tat was not witin +5% of rated capacity. These are great charge and store batteries. I tested the self discharge features at temperature ranges from -16C to +30C no issues. You should be able to litterally charge your system and leave it for the winter and come Spring you will have far less potential of severe discharge issues. Charge --- Store--- fly! On Sun, Apr 6, 2008 at 5:45 PM, Jeff Steifel <[EMAIL PROTECTED]> wrote: Anyone using the new sanyo eneloop batteries? The sanyo site says they have reduced internal resistence, but they don't give numbers. Just sales info. -- Jeff Steifel RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format !DSPAM:47f987c6721844697714321! This message was sent using IMP, the Internet Messaging Program. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
RE: [RCSE] New sanyo batteries
Hi Jeff and All, I have three 4-cell Eneloop AA size receiver packs in service in F3B/F3J models and an 8-cell pack in my Graupner/JR MX22 transmitter. I have no information on their internal resistance but they live up to all their manufacturer's performance claims. Capacity, when charged at 250 mA, exceeded the specified 1900 mAh minimum on the first charge and was approximately 2000 mAh after cycling a further two times. When charged at 700 mA capacity is only a little less. There was almost no variation in these figures for my four packs. By the way, I judged capacity by discharging to 1 V/cell at 300 mA. I am not sure if this is the standard technique but I think it gives a good indication. When fully charged and stored for one month capacity dropped by only 5%. I tested this on one pack only. I have not had any other AA NiMH packs that performed nearly as well. In fact I had decided to go back to NiCd for Rx and Tx use until I tried the Eneloop cells. At my local camera shop they are no more expensive than other high capacity AA NiMH cells, and are cheaper than many. They don't have solder tabs, but I have had no trouble making up packs so I don't see this as a problem. * Ian RoachKiama, NSW Australia [EMAIL PROTECTED] Phone: 61 2 4232 1775 * -Original Message- From: Jeff Steifel [mailto:[EMAIL PROTECTED] Sent: Monday, 7 April 2008 10:45 AM To: rcse Subject: [RCSE] New sanyo batteries Anyone using the new sanyo eneloop batteries? The sanyo site says they have reduced internal resistence, but they don't give numbers. Just sales info. -- Jeff Steifel RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] New sanyo batteries
No they are your basic consumer AA cels make sure you use a hot soldering iro so you don't have to sit there with the iron heating up the whole cel. On Sun, Apr 6, 2008 at 7:51 PM, <[EMAIL PROTECTED]> wrote: > I've poked around and didn't notice... but do they come with solder tabs? > I > didn't see any. > > Kurt > > > > > Quoting David Webb <[EMAIL PROTECTED]>: > > I have been extensively testing these batteries for over 6 months. They > > are > > installed in my TX and RX on my primary and secondary Pike Perfects. > > > > The reduced self discharge rate is totally true. My RX packs held 5.75 v > > for > > 6 months which is what they were 10 mins afetr the charge was complete. > > > > I charge mine using a triton charger at .6-1A. with no heat issues at > > all. Discharge at .4-.6A takes about 2.5 hours and I have not had a pack > > tat > > was not witin +5% of rated capacity. > > > > These are great charge and store batteries. I tested the self discharge > > features at temperature ranges from -16C to +30C no issues. You should > > be > > able to litterally charge your system and leave it for the winter and > > come > > Spring you will have far less potential of severe discharge issues. > > Charge > > --- Store--- fly! > > > > > > > > On Sun, Apr 6, 2008 at 5:45 PM, Jeff Steifel <[EMAIL PROTECTED]> wrote: > > > > Anyone using the new sanyo eneloop batteries? > > > The sanyo site says they have reduced internal resistence, but they > > > don't > > > give numbers. > > > > > > Just sales info. > > > > > > -- > > > Jeff Steifel > > > > > > RCSE-List facilities provided by Model Airplane News. Send > > > "subscribe" > > > and "unsubscribe" requests to [EMAIL PROTECTED] Please note > > > that subscribe and unsubscribe messages must be sent in text only > > > format > > > with MIME turned off. Email sent from web based email such as Hotmail > > > and > > > AOL are generally NOT in text format > > > > > > > > > > !DSPAM:47f987c6721844697714321! > > > > > > > > This message was sent using IMP, the Internet Messaging Program. > >
Re: [RCSE] New sanyo batteries
I've poked around and didn't notice... but do they come with solder tabs? I didn't see any. Kurt Quoting David Webb <[EMAIL PROTECTED]>: I have been extensively testing these batteries for over 6 months. They are installed in my TX and RX on my primary and secondary Pike Perfects. The reduced self discharge rate is totally true. My RX packs held 5.75 v for 6 months which is what they were 10 mins afetr the charge was complete. I charge mine using a triton charger at .6-1A. with no heat issues at all. Discharge at .4-.6A takes about 2.5 hours and I have not had a pack tat was not witin +5% of rated capacity. These are great charge and store batteries. I tested the self discharge features at temperature ranges from -16C to +30C no issues. You should be able to litterally charge your system and leave it for the winter and come Spring you will have far less potential of severe discharge issues. Charge --- Store--- fly! On Sun, Apr 6, 2008 at 5:45 PM, Jeff Steifel <[EMAIL PROTECTED]> wrote: Anyone using the new sanyo eneloop batteries? The sanyo site says they have reduced internal resistence, but they don't give numbers. Just sales info. -- Jeff Steifel RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format !DSPAM:47f987c6721844697714321! This message was sent using IMP, the Internet Messaging Program. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] New sanyo batteries
I have been extensively testing these batteries for over 6 months. They are installed in my TX and RX on my primary and secondary Pike Perfects. The reduced self discharge rate is totally true. My RX packs held 5.75 v for 6 months which is what they were 10 mins afetr the charge was complete. I charge mine using a triton charger at .6-1A. with no heat issues at all. Discharge at .4-.6A takes about 2.5 hours and I have not had a pack tat was not witin +5% of rated capacity. These are great charge and store batteries. I tested the self discharge features at temperature ranges from -16C to +30C no issues. You should be able to litterally charge your system and leave it for the winter and come Spring you will have far less potential of severe discharge issues. Charge --- Store--- fly! On Sun, Apr 6, 2008 at 5:45 PM, Jeff Steifel <[EMAIL PROTECTED]> wrote: > Anyone using the new sanyo eneloop batteries? > The sanyo site says they have reduced internal resistence, but they don't > give numbers. > > Just sales info. > > -- > Jeff Steifel > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" > and "unsubscribe" requests to [EMAIL PROTECTED] Please note > that subscribe and unsubscribe messages must be sent in text only format > with MIME turned off. Email sent from web based email such as Hotmail and > AOL are generally NOT in text format >
