I. Discharge before charging
After you solded a battery pack, the most important thing is to discharge each battery cell properly (~0.02V). Novak Smark Tray or Trinity Absolute Zero is recommended. After discharging is completed, take out the battery from the discharger and store it for next charging use.

II. Charging: Large electric current Vs Small electric current
When using large current(6-8A) to charge NiHM battery, high explosive power can be obtained but slightly decreases the total run time(approx. 10-15 sec.). Contrastly, using small current can increase the run time but decrease a little bit in the explosive power.

Another important factor you need to consider is that the life time of the battery cell is decreased when you charge it with large electric current each time. If you decide to use large electric current to charge the battery cell, it is recommended that you slightly increase the electric current to avoid the permanent damage to the battery itself.

Hints for reference:
Modified Motor: 5.5-6.0A is recommended to ensure the overall performance.
Stock Motor: 6.0-7.0A in general. The performance of turning and accelaration are improved.

Good method to charge battery cell:
Try to shorten the waiting time between the completion of charging and the beginning of the car run. This can ensure the highest efficiency of the battery. Longer the waiting time, weaker the efficiency of the battery.

III. Peak Voltage
Peak voltage is the point before the battery cell is fully charged in the charger. It is found that 0.02 or 0.03 is a good stop point. More than the value can cause overheating or damage to the battery cell. However, low value can cause the battery cell that cannot be fully charged. You can try to find an old battery pack to find the good value.

IV. After Run
When you know you will use the battery cells again after one week, store the remaining battery cells. This can prevent one of the battery cells that cannot be fully charged. When you will use the battery cells the next day, discharge first. One night store time won't hurt the battery cells. It is not recommended to store the battery cell more than one night time when it doesn't have electricity.

V. Preparation for next Run
Most of peoples like to discharge the battery cells 24 hours ago. Discharging produces heat, the battery cell can have enough rest if doing so in 24 hours ago. If you need to re-use the battery within one day, you must cool down the battery to proper level before charging (you can use a cooling fan to do so). It will damage to the battery cell if it is not cooled down enough before charging.