I've just ordered some new GP3300 NIMH batteries and wanted some advice on how to care for these batteries.
RacerHobbies.com recommended with this:
These cells should be charged at 5-6 amps with a re-peak of 5-6 amps just before you race. When finished racing, discharge pack to .90 volt per cell in the pack. The next time you plan to use these cells, discharge them at 1-4 amps down to .2V/cell before you charge them.
Promatch Racing wrote this on their web site:
The following information is for Panasonic 3000 UMH, GP3300, Sanyo 3000HV, and Sanyo 3300 cells.
Excellent results can be obtained by following these guidelines. After using the packs you need to determine if they are completely discharged or not. If you are not going to race the packs again for more than a week you should put at least 10 minutes of charge (at 4 amps) back into them. See footnote below** Leave the packs alone until the day before you are going to use them again. The day before you use them discharge them down to .9 volts per cell (5.4 volts for 6 cells and 3.6 volts for 4 cells) and let them sit overnight.
**Footnote: The longer you plan to not use the packs the more charge you should leave in them. For long term storage (more than 30 days), I would completely charge the packs before storing them. Also expect some false peaking problems of these cells after a long period of inactivity. This problem should correct itself after one or two uses.
For Panasonic 3000 UMH and GP 3300 cells. Right before you plan on charging your packs place them into the Smart Tray II to equalize the cells. After the last led on the tray goes out or 20 minutes on the tray (whichever occurs first) immediately put the pack on your charger and begin charging them. DO NOT DEAD SHORT NIMH CELLS! This will adversely affect them in the long term.
Question: What discharging device would you recommend that will discharge to .9volt per cell, and also can drop it down to .2 volt per cell. What's your opinion on this discharging method? They also mentioned that I need to avoid dead short. Can you tell me what dead short means?
One company recommends equalizing tray, and the other doesn't say anything about it. The one comment might be only to push their products. Any opinions on this would be appreciated.
If you guys do recommend a equalizing tray, any opinions on the Integy discharging trays?
Also based on what I'm reading, it doesn't appear to be harmful to NIMH to leave a charge on it. I'm gonna assume that based on what I've read, I need to ONLY discharge the night before I need to use them again.
I guess what I need is how you handle your new GPs, from charging to storing. Thanks a lot.