V1.0
RUNGU Electric Juggernaut Mid-Drive Version (MDV) User Manual
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2018 model year
Copyright 2018 Standard Bearer Machines, LLC
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Rungu MDV Maintenance and Care
Battery Care
There are three rules to extend battery life in day to day use:
1.
Charge the batteries in a cool, dry location. Heat is not a friend of the charger or the battery.
2.
Only fully charge the batteries if you plan to use the MDV in the next few days.
3.
If you plan to not use the MDV for more than a few days, keep the batteries charged around
50% of their capacity (Voltage level of 50-52 V) and recharge the battery the day before your
next ride.
CAUTION: IT IS IMPORTANT THAT THE BATTERY CHARGER GETS AIR FLOWING OVER THE
HEATSINK AND IS OUT OF DIRECT SUN TO AVOID OVERHEATING OR BATTERY FAILURE
Storage When Not Using MDV for Periods of Two Weeks or Longer
Standard Bearer Machines selected these batteries and the electrical system to be as maintenance free
as possible. In the event you plan to not use the Electric Juggernaut for a period of more than three
weeks, open the battery case, disconnect the battery from both connectors, and remove the battery
and store it with ~50% charge (around 50-52V). If you are storing them long term (for the winter) it is
best to store in a room temperature location and away from the MDV. For best results, every month you
don’t use the
MDV, hook the battery up to the charger for 10-20 minutes as the battery will lose charge
over time and this will allow you to put some extra charge in the battery and balance the cells.
Note: You can purchase an outlet timer that switches the charger on every week for a period of 10
minutes and keep the charger connected to the battery. In this situation, the charger is only powered
by AC when the outlet timer is on.
Prolonging the Life of your Battery
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Best Practices
The Electric Juggernaut features the most powerful, lightest weight and best performing batteries on
the market. NMC based systems should expect around 3-5 years of use depending on how you take care
of your battery and up to 1000 charge cycles. These batteries do have a shelf life so even if you are not
using the pack, the battery will only be good for so long.
To prolong the life and performance of the pack, it is best to not drain the pack to zero capacity (like
when the battery management system shuts it off). Going from 100% to zero capacity will adversely
affect your life cycles. It is much better, for instance, to go from 100% to 50%. If you only rode your bike
3 miles every day, you are better off charging the battery after each ride instead of waiting until the
battery is dead. Keeping the depth of discharge less than 80% (so from 100% to 20%) will make sure you
get the full life from the battery.
Heat and discharge rate also will adversely affect the life and performance of the battery. If you want
more life from your battery and system, it is best to use a lower power level. The lower the power level,
the less stress (and heat) it puts on the battery cells and battery management system. This equates to a
longer cycle life and higher performing battery.
