I've had this Burgess charger since the late 1970s or so, it says it is for Ni-Cads and carbon zinc. For Ni-cad 9 volts it says to charge for 3 hours maximum. I purchased 2 new MTH Ni-cads recently - the green ones, and need to charge them prior to installation in PS2.0 engines. Am confused because MTH engine instructions say to charge overnight. Note some of my PS2.0 engines have charging jack - and I can charge the new batteries after installation, but some are older and don't have the charging port, so I will need to use either existing charger (if its acceptable) or find one that MTH recommends.
Thanks.