Ok, I'm nearly ready with my new (1st ever heli)

[kevinh]

nimahs can be charges using the same charger and they dont suffer from memory effect.

"The memory effect in electrical batteries, also known as lazy battery effect, is an effect observed in some rechargeable batteries that causes them to hold less charge. The term has become almost universal in describing any such effect, though in its original meaning it describes one very specific case. NiCd batteries gradually lose their maximum energy capacity if they are repeatedly partially discharged before being recharged. This is termed the memory effect. A major advantage of NiMH battery technology, apart from lack of toxicity, is the absence of any memory effect - NiMH batteries are remarkably tolerant of frequent 'top-up' charging"

[Gaza07]

How about this as a choice
http://cgi.ebay.co.uk/ws/eBayISAPI.d...6153&rd=1&rd=1
ive had other packs from them and the cells seem fine and charge to the correct amount
They say nimh do not suffer from memory and ive never found them to

[David Drew]

kevinh...that's a bloody good, clear answer.

mimh on order..thanks

David

[kevinh]

kevinh...that's a bloody good, clear answer.

mimh on order..thanks

David

thank google not me

[Nutz]

Ni-cd batteries crystal up quicker than Ni-MH which is what causes reduced capacity (otherwise known as memory effect). A deep dis-charge cycle helps get rid of the crystals but can also damage cells as you risk reversing the polarity of a weak cell. Ni-MH are more resilient to this but they also become lazy if left standing for a while and also loose capacity quicker then Ni-cd when they are in storage for a period of time

Ni-MH also seize up if they are not used for a while but if you cycle them a few times (took me 5 cycles last time) it will accept its capacity or there about.

It is always best to use a digital charger with delta peak detecting to help protect your battery as it is the only thing keeping the vital radio link up and you in control of your model

Ni-MH can give out more amps and hold the voltage better under load but they have a sharp voltage drop at the end of the pack. You must be careful of this, as I have seen people turn there models on with a healthy battery level and then a few minutes into there flight the crash and find out the battery was dead. It has even happened to me with a helicopter, turned on, battery was good, and during the flight the tail servo stopped working (9254) which forced me to land. It was only because that was the most power hungry servo on the helicopter at the time that I did not lose the other controls. Ni-cd has a softer voltage drop at the end of the pack capacity

Ni-Mh gives is out amps (power) better than Ni-Cd and sub C also cells give out better amps (power) than AA cells

I charge all my packs regardless of size and capacity at 400mAh so a 2600 partially discharge will take around 3-4 hours.

I run a 3600 Ni-MH sub C pack on my Titan only because of the powerful digi servos that I run, but most people use a 2400 sub C pack.

Summery
Ni-cd
Slower voltage drop at end of pack
Holds voltage better during storage
Don't get lazy as quickly during storage

Ni-MH
Provides better amps
Holds voltage drop better under load

[David Drew]

Ta Nutz

I use a Multiplex charger, so a decent nimh, say 2400mah, is well within it's capabilities.

More dosh going out.....hobbies, who'd have em?

David

[Nutz]

How about this as a choice
http://cgi.ebay.co.uk/ws/eBayISAPI.d...6153&rd=1&rd=1
ive had other packs from them and the cells seem fine and charge to the correct amount
They say nimh do not suffer from memory and ive never found them to

Vapextech are good packs. I have a 2000mAH in my FF9, it has been in service well over a year now, I do find that on each charge they take a little less back in, I think the are holding around 1600-1700mAh but for the price I paid and service I got form them I am not complaining. But my Sanyo cells are better.

All battery's apart form lead acid suffer memory affect.
Memory effect is where the pack takes less capacity that what is stated on the pack and over time all batteries do it.
It is just that it is more noticeable in Ni-cd and battery care plays a part in this.