Re: [RCSE] Transmitter pack - Walmart 1850 mAh AA cells
I lost a brand new Xtreme last year at CASA in quite spectacular fashion due to a dead cell in the (new) airborne pack. Don't try to save money on batteries. I saved about $12 on the airborne pack by using "decent" quality bulk nicads. For that $12 savings, I turned a beautiful $1000 molded ship into a pile of rubble that couldn't even be identified by dental records. Enron accountants would have been proud of my accomplishments. Please learn from my mistakes. Tom Siler Columbus, OH 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.
Re: [RCSE] Transmitter pack - Walmart 1850 mAh AA cells
Howard Mark wrote: I'm curious as to why you say they royally suck at this charge rate? Is this just a problem with the Energizer brand? I never mentioned charging rates in my messages, just discharge rates. -- Andrew E. Mileski Ottawa, Canada http://isoar.ca/ 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.
RE: [RCSE] Transmitter pack - Walmart 1850 mAh AA cells
Andrew, If you follow the digital camera forums, you'll see these mentioned all the time (1600+Mah NiMh batteries). I have read that there are some in the 1800Mah range that are pretty reasonably priced, and can be had with a 1 hr charger. I would guess that those can be fast charged no problem. I've been fast charging NiMh batteries since I've been using them without adverse effect - except perhaps a bit diminished life. The 1600 cells work great in a digital camera - which has about the same current draw as a transmitter (perhaps a bit more). I'd not hesitate to try a 2C (or more) charge on these, at lease for a short time, dropping to 1C or less to finish the job. I'm curious as to why you say they royally suck at this charge rate? Is this just a problem with the Energizer brand? Mark -Original Message- From: Andrew E. Mileski [mailto:[EMAIL PROTECTED]] Sent: Friday, February 21, 2003 6:19 AM To: [EMAIL PROTECTED] Subject: [RCSE] Transmitter pack - Walmart 1850 mAh AA cells Has anyone tried to use the Walmart Energizer AA size 1850 mAh Ni-MH cells in a transmitter pack? From the data I've been able to gather on these, they are limited to C max (they seem to be rated to 2C but royally suck at that). My 8103 takes about 250 mA, so they should be just fine. Not good for airborne packs though. If someone has found contrary data, please share! Thanks! -- Andrew E. Mileski Ottawa, Canada http://isoar.ca/ 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. This message is intended only for the use of the Addressee and may contain information that is PRIVILEGED and CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please erase all copies of the message and its attachments and notify Space Imaging immediately. 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.
Re: [RCSE] Transmitter pack - Walmart 1850 mAh AA cells
Kevin Sheen wrote: I've been using Radical RC NiMH packs for the last 2 years in most of my planes and in my JR 783 transmitter. Not a single problem with any of the packs. I'm not sure where you are getting the discharge rates below, but I've seen speed 400, speed 280 and below use them as motor packs! and I guarantee you, they discharge them faster than C or even 2C. Check out radicalrc.com, he may have some data on usage of NiMh packs and their charge / discharge recommendations. First off, I'm in Canada, so buying anything from the states costs too much in time, customs, exchange, and shipping :( So I try to find alternate sources. The Energizer cells from Walmart are reasonably (about $5.50 CDN/cell), and are available locally (at least 2 Walmart stores here). Secondly, not all cells are created equal. These ones (Energizer NH15) seem to be designed for the consumer market, not the wing flapping electric flight market. The only datasheet I can find is: http://data.energizer.com/datasheets/library/rechargeables/consumer/nimh/nh15.pdf At 2C the cell voltage is radically depressed. I have doubts that these particular cells could handle the Amps like say HR-4/5AUP NI-MH cells could, which are also larger with less capacity for this very reason. This wasn't a thread about the merits of Ni-MH (which I already use), rather the merits of these specific cells :) -- Andrew E. Mileski Ottawa, Canada http://isoar.ca/ 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.
[RCSE] Transmitter pack - Walmart 1850 mAh AA cells
Has anyone tried to use the Walmart Energizer AA size 1850 mAh Ni-MH cells in a transmitter pack? From the data I've been able to gather on these, they are limited to C max (they seem to be rated to 2C but royally suck at that). My 8103 takes about 250 mA, so they should be just fine. Not good for airborne packs though. If someone has found contrary data, please share! Thanks! -- Andrew E. Mileski Ottawa, Canada http://isoar.ca/ 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.
