Background: Both of the planes I have purchased used have come with used radios and Batteries, I havn't had any problems yet however once I've had my fourth flight of the day I tend to pack up and head home for the day to to fears that my batteris are getting low.
I decided to purchase some new batteries, I picked up the following batteries


Hobbico Hydrimax 1450mah transmitter pack
http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXBGF3


Hobbico hydrimax 2000mah 4.8V reciever pack
http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXNRJ9

my wall charger puts out 70ma on the transmitter and 100 ma on the receiver pack will I need to pick up a new charger to fully charge these packs or can I just add time to my charging cycle and how long?


Thanks for your help

G'day Mate,
Check out these sites, lots of useful info about batteries, follow these & you won't regret it.
http://members.aol.com/davthacker/balancecharging.htm
http://www.rcbatteryclinic.com/

It would be a really good idea to also buy a battery tester. A simple one [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNK81&P=ML]like this[/link] works fine. This will allow you to fly longer and have a better idea of the state of your batteries. I actually test my batteries at the beginning of the day just to be sure they're ok.
In answer to your question, yes the charger will work, but you will need to add time. The formula I've seen is that charging nimhs is about 66 percent efficient. This means if you're charging a fully discharged 2000 mah battery at 100 mah you would need about 30 hours. Since in practice, you would never discharge it fully, the time needed to charge would be less.