About my TDS3BATB that reads Capacity Inaccurate: after a complete discharge and charge, now it reads Capacity Inaccurate + Valid Discharge. I expect CI (and VDQ) to go away after one more full discharge, meaning the gas gauge is calibrated.
If you want fast charge but don't have a TDS3CHG/TDS3ION, it looks like a normal bench supply will do. I set mine to 18V with 1.8A current limit, based on the TDS3CHG spec sheet. Connecting it to the TDS3BATB external charge coaxial connector, I see about 1.3A which tapers after a couple hours then shuts down to a few tens of mA at charge complete. I will probably charge them this way - outdoors - if Tek continues to refuse my packs for recall. And store them in a metal box. That should be safe.
To extend battery life I will store them only about half-charged.
On initial installation in a scope running off the mains, I see the usual six register reads, then this, once:
read 0x7 (PPD Program Pin Pull Down) == 09 i.e. Prog1 and Prog4 power-on straps were low
read 0x8 (PPU Program Pin Pull Up) == 80 i.e. no power-on straps were high, so Prog2/3/5/6 were all in 'Z' state
(By the way, one thing this means is the cells are coke anode, not graphite anode.)
write 0x8c (VTS End Of Discharge Threshold Select) = 0xA2 i.e. 10.63V
read 0x0c (VTS) to confirm it is 0xA2
(The exact value was probably stored in RTC RAM and depends on what the scope read on VSB just before it died.)
For more info, see "Battery voltage and pinout for Tektronix TDS 3000 series oscilloscope",
https://www.eevblog.com/forum/testgear/battery-voltage-and-for-tektronix-tds-3000-series-oscilloscope