Greetings,

I've just finished making up 3 new 3S1P A123 packs, and have been unable to charge them with the Sonic charger today. I tried all 3 packs, and didn't notice any difference between them. I had asked about the proper balance connection, and hope what I was told (not by A123) is correct. I know that the charger will give you an error light if you unplug the balance connector, so I presume it would also give an error if the wires were reversed. Since I don't have an error light, I'll assume it's wired correctly.

These were new cells from a popular yellow and black pack, and each cell was 3.3v initially, and the pack total was 9.9v. I ran one pack down until the power fell off, then measured the voltage at 8.45v when I put it on the charger. The charging light blinked constantly for a long time, then slowly started to settle down, until it's on solid, with occasional blinks. I have a clamp DC ammeter on the leads, and am seeing virtually no current flow into the pack. 3 hours later, the pack is up to only 9.52v.

I also tried a single cell, which just sits at 3.31v whether the charger is plugged into it or not. The charging light is on, but there's no current flowing.

Does the first charge of these cells just take forever, or is my charger not working correctly? I fear the latter []

Cheers,
Rusty