This is strait from the Fukuyama tech section of the website. I follow this exactly and I have packs that are a year old that are still in good shape. This is the process we reccomend to our customers.
Charging Battery Pack:
During your initial charge for race day, we recommend you equalize the cells on a tray so all cells are at .90 volts before charging begins. We use our Competition Electronics Turbo 35 GFX to charge but other chargers will work Please make sure your charger is capable of charging Nimh cell and is set to run linear charge interface. Turbo flex or FLEX CHARGING is to be turned off or disabled during the charge on Nimh. If you charger has trickle charge for NiCad, it will also need to be turned off or disabled. We have been using a linear 6 amp charge rate with very good results. But a 5 amp charge will give you a slightly more runtime. For maximum performance, we suggest you to peak just before your race. If it has been sitting for more than 30 minutes, repeak with the same setup as the initial charge. If it's been sitting for 5 minutes or less you can repeak it with a .01( 10 mv ) peak detect.
Peak detect cut-off ( voltage threshold ):
We suggest a .05 ( 50 mv ) for 6 cell packs.
We suggest a .03 ( 30 mv ) for 4 cell packs.
You cells should be warm to slightly hot but not burning hot. To determine this, the temperature should be between 135f to 155F. If the temperature reaches above 155F, it is suggested that you shut off your charger or turn down your peak detection. Charged packs should be right before you race while the pack is still warm. Warning!: Over-charging your cells will damage them or shorten itís lifespan. Always charge your cells away from flammables and leave open spaces at to vent around the pack during charge.
Lately, it has been brought to our attention that another renowned matcher has suggested DEADSHORTING the packs. While this may seem like a good idea to most but some racers are unaware of the consequences if done wrong. First, each and every cell has to be brought down to 0.00 volts. This is not an easy task since as soon as you lift the pack off the discharging tray, the chemicals inside the cells will react and come back to life gradually filling back up. This will cause you to short the packs and ruining the cells internal structure. Second, the voltage gain is very slight and you risk loosing valuable runtime in the process. Third, fires or sparks may cause injuries due to shorting out a pack with voltage still in it. Fukuyama Racing does not suggest you DEADSHORTING the cells to gain that ever-so-slight increase in voltage and taking a risk that yields no benefit other than following what other risk takers are doing. USE YOUR OWN JUDGMENTS AND AT YOUR OWN RISK. WARNING!: FUKUYAMA RACING WILL NOT ASSUME ANY LIABILITIES NOR TAKE ANY RESPONSIBILITIES FOR DEADSHORTING THE CELLS.
Discharge & Storing Battery Pack:
At the end of the race day, discharge the pack down to .90 volts per cell. This equals to 5.40 for a 6 cell pack or 3.60 for a 4 cell pack. Let the pack rest until the next time you plan on using them. You do not need to place them on the tray. You can store it without any charge on these newer GP 3300. WARNING!: MAKE SURE YOUR CELLS HAVE COOLED COMPLETELY BEFORE STORING THEM IN A CASE OR BOX.
We do not suggest cycling your packs simply because it yield no benefit except making your packs work an extra cycle. We do however suggest that when cycling, make sure the packs have adequate time to cool before discharging. A quick cycling method will most likely hurt your cells because of heat.
If you have any questions about Fukuyama Racing Battery pack, feel free to call us at 1-626-442-6683 during business hours or email us at email@example.com
. Our technicians are more than happy to answer your questions.