F&Q Charging Batteries

IMPORTANT: The battery needs to be charged prior to the first ride. The packs are shipped with 30-50% state of charge only!

It is important to fully charge the battery to 100% for the first few cycles, leave it on until the charger stops...this can take quite a few hours (depending on the capacity and charger rate). Also please charge in a safe place.

Charging time is quite simple to estimate:

A 13.5 ah GA shark pack will require about 5 hours at 3amps (standard basic 3amp charger), about 4.5 hours to put back most of the charge (13.5ah / 3amps = 4.5h) and about 30 minutes to fully change and balance the battery after the initial charge (constant voltage) CV on the graph.

When new the battery can take a few cycles to balance and settle. This is called the break in period.
Typically, we recommend charging to 100% for 4 to 6 charge discharge cycles. It is also important during the break in period not to run the pack to Low Voltage Cut Off. Also take it easy on the pack by not drawing maximum amps, otherwise the pack will not balance and this can lead to the pack shutting down prematurely. If the pack does charge to 58.8 volts (52 volt battery. 54.6 for a 48 volt, 42V for a 36V or 84V for a 72V battery) then the pack is well balanced. Lower voltage may mean the pack may be out of balance or the charger is not fully charging to 58.8 volt. Normally after the battery has been disconnected the pack can drop a little, this can be up to 1 volt. This is not uncommon.

Link HERE to checking the charger voltage, post 1

If the charger is charging to 58.8 volts you do not need to discharge fully, you can discharge the pack a few volts and then you charge it again to 100% and let it sit unplugged for a few hours. Balancing only occurs when one or more cell group reaches the 4.2V per cell mark.

If you need to adjust the charger follow this link.

Break in Period

The battery when new can take a few cycles to balance and settle. This is called the break in period.
Typically we recommend charging to 100% for 4 to 6 charges. It does not have to be full discharges or full cycles, it can be shallow discharges, Just discharge gently (can be as little as 1V discharge) and then let it cool down and charge again till you see a green light and repeat a few times!

Its also important during the break in period not to run the pack to Low Voltage Cut Off. Also take it easy on the pack by not drawing maximum amps otherwise the pack will not balance and this can lead to the pack shutting down prematurely. If the pack does charge to 58.8 volts (52 volt battery. 54.6 for a 48 volt, 42V for a 36V or 84V for a 72V batt) then the packs well balanced. Lower voltage may mean the pack maybe out of balance or the charger is not fully charging to 58.8 volt. Normally after the battery has been disconnected the pack can drop a little, this can be up to 1 volt.

If the charger is already charging to 58.8 volts you still need to do a break-in and do a couple charges to 100%, charging to 58.8V does not mean the cells are balanced, some cell can be at 4.24V and csome to 4.16V. So what you can do is to discharge the pack a few volts and then you charge it again to 100% and let it sit unplugged for a few hours. Balancing only occurs when one or more cell group reaches the 4.2V per cell mark.
If you need to adjust the charger follow this link.


Additional Links

18650 cells

Australian Batteries 

New Zealand Batteries



http://electricbike.com/forum/forum/...lance-charging

Link to full thread here: