SHDesigns Charger Mod

[Chamkeeper]

Does this sound feasible? I am thinking of modifying the SHDesigns Ver. 3 charger ( http://www.shdesigns.org/pdf/lionchg3.pdf ). I am considering adding a comparator to match the output with cell count selected by double poling s1:1 and s1:2, to a fixed value of cell count * 3V. If the cells were deep discharged, the comparator would limit the current by disconnecting (through a transistor or FET) the anode of D1 from s1:3,4,5,6,7 & 8. After the slow charge brought the voltage to the safe level for faster charging the transistor would be saturated and therefore reconnect the charge rate selection switches to the negative side of the circuit.

I don't have the parts to build this here, yet...

[Dan Baldwin]

Yes, it would probably work fine, but personally the last thing I want to do is to automate the process of trying to restore batteries that have been over discharged. Lipolys are damaged by being over discharged, and you need to do whatever you have to to make sure that it doesn't happen. I would rather have a charger like an Apache 2500 that just refuses to charge batteries when they have been over discharged, rubbing my nose in my screwup. It's up to me to figure out how to get them back up to a level where the charger will take over.

But that's just my opinion

Dan