hi
i only use NICADS for 20 plus years in two cycle glo planesonly batteries there were 20 years agonever a battery issuewith proper maintenance
if the battery cycles twice every 2-3 months i will fly it if it has not lost 20 % of its capacity
always cycle a new battery 2-3 times to bring up its capacity ( this is the number you will deduct 20% from in the future )
do not care how old the pack is it has passed the required cycle testI FLY IT
slow charging is always best
keep NICADS fully charged when storedprevents shorts
find that the peak chargers i have used have shortened my battery pack life a lot over slow charging at 10c or trickle charging which is best
fast charging is damaging your best cell in a packas that cell is almost at a capacity charge when you start the charging

you will feel the servo's get slower -when the battery gets weakeras you are flying the plane learned this from my trainer flying for 30 years

get my best results charging NICADS with a wall chargerand cycling with an ACE DIGIPACE- went back to doing what i used to do after using a peak chargerthat truly shortens battery pack life far to much for my liking
BEST REGARDS TONY