Got my orion charger out this morning and tried to replicate your problems.
The only thing that would cause this in my efforts were
1...the battery you are trying to charge has been discharged too far. The charger will try to trickle charge it but will not charge at the full rate you have programmed in
2 You may have set the battery data wrong
eg when I tried to charge my old 3300mah mardave battery on the program for my 4600mah battery the charger will only trickle charge them and not go to the full settings. The charger computes that the battery to be charged has too low a capacity so will only trickle it.
Other than this your only hope is to take your battery to a local club and ask someone look at your charger.
1500mah is very low capacity what are you putting it in. Could be after a 5 min race the battery has just discharged way too low.
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