Saturday, April 23, 2005

Andre on NimH batteries

I have noted some warnings on SARFLY about the use of NimH receiver packs. As I have been using a 650 mAh NimH receiver battery pack in my 40 size Acrow Wot without any problems for the past 2 years, the following comments may be helpful:

Be aware of the fact that NimH batteries have a higher self-discharge rate than Nicads. Recharge your NimH batteries on the day that you intend to fly - my GP 3300 cells normally take another 400-500 mAh charge, even if I charged them the previous day. My el cheapo (Uniross) 650mAh NimH receiver pack normally takes another 100 -200 mAh to full recharge after standing for a few days. NiCads have a lower self discharge rate, and thus stay fully charged for longer.

Note that the voltage drop under load on NimH batteries are higher than Nicads - which may slow down your servo response under heavy loads. My suggestion would be to use a 5 cell battery pack if using "El Cheapos.

The discharge curve on NimH batteries is steeper than Nicads - gradual loss of power vs sudden drop with Nicads. May be a good thing though - if your plane becomes sluggish, consider landing. If you were using Nicads, you are in trouble as you should have been on the ground already!



No comments:

Blog Archive

Total Pageviews


Web site terms and conditions

Copyright of material on all the pages of this site is vested in the SAMAA or the original authors. You may use the material in terms of the Creative Commons license for non-commercial purposes on the condition that you acknowledge its origin.

This work is licensed under a Creative Commons License

The views expressed on this web site, or on any directly or indirectly linked site, are not necessarily those of the SAMAA Committee, or the web editor. The information provided on this site is provided for recreational purposes only. The SAMAA and the authors of presented content assume no liability whatsoever on the use of information contained in this site. The information on this site is provided on an "as-is" basis, without warrantee of any kind. Links provided on this site will let you leave the SAMAA web site. The linked sites are not under the control of the SAMAA, and the SAMAA is not responsible for the contents of any linked site, or any link contained within a linked site, or updates to such sites.