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
