You should do a C/10 for 16 hours on new cells but since you can't on a BC900, so do the first charge at 200ma. Do the math! Lots of BC900 v32 have melted with new high capacity cells, they may terminate early or not at all, so time the cycle. I don't trust the BC900 since mine(v32) melted.
at 200 it is at c-10 or less, being a sanyo battery it might not CUTOFF.
i dont recommend charging energyser or sanyo high capacity mi-mhys at low rates on chargers that look for voltage drops.
because at low currents there wont BE a voltage drop.
the sanyos/energysers are very durable and might not Vdrop.
if the charger is DEPENDANT on a vdrop, then you just bake the batts, with Low currents, and that could be a possible reason the charger melts down.
i have seen a bat sit there and not get to a cutoff, it should be an adequite overcharge occurance. meaning it should NOT get the batts hot at c/10 or less. but it did, and it didnt look like a good situation.
back 10+ years ago, when they had DUMB chargers, they would be c/10-c/16, and you just left it on the charger. BUT there was a big diffferance between the voltage MAX they could reach and current controls.
a DUMB charger would slow down at the end. A smart charger cannot slow at the end, and they dont unless they have High voltage cutoff ALSO.
a smart charger using current control, might not slow down at the end, in fact if it did, it would not be able to reach voltage drop, because the battery is handling the overcharge. overcharge ITSELF is why the batt drops voltage.
dang why is it so confusing to explain.
dumb chargers had a protection sort that they COULD be dumb, so they could be left on forever , unless the battery was ruined.
smart chargers will prefer to charge faster, so they can SEE the vdrop. and they arent really smart