Battery pack system

A battery pack system, comprising:

• a plurality of system parallel groups connected in series, each system parallel group including a plurality of battery packs connected in parallel;
• each battery pack including a plurality of parallel groups connected in series, each parallel group including a plurality of batteries connected in parallel;
• electronics configured to charge the battery packs at a first current level and to drop the current from the first current level to a second current level one or more time while charging the battery packs, the second current level being lower than the first current level;
• the electronics being configured to stop intermittently dropping the current from the first current level to the second current level when the first current level rises above an upper current threshold;
• and
• the electronics being configured to stop intermittently dropping the current from the first current level to the second current level when the first current level falls below a lower current threshold.

A battery pack system, comprising:

• a battery pack including a plurality of parallel groups connected in series, each parallel group including a plurality of batteries connected in parallel;
• electronics configured to discharge and/or charge the battery pack;
• and
• one or more shunt circuits configured to bypass one or more of the parallel groups, the shunt circuits being activated by the electronics.

A battery pack system, comprising:

• a pack assembly having a plurality of system parallel groups connected in series, each system parallel group including a plurality of battery packs connected in parallel;
• electronics configured to charge and/or discharge the pack assembly;
• and
• one or more shunt circuits configured to bypass one or more of the system parallel groups, the shunt circuits being activated by the electronics.

A battery pack system, comprising:

• a battery pack including a plurality of parallel groups connected in series, each parallel group including a plurality of batteries connected in parallel;
• electronics configured to discharge and/or charge the battery pack;
• and
• a switch connected in series with one or more batteries, the switch being operated by the electronics.

A battery pack system, comprising:

• a pack assembly having a plurality of system parallel groups connected in series, each system parallel group including a plurality of battery packs connected in parallel;
• electronics configured to charge and/or discharge the pack assembly;
• and
• a switch connected in series with one or more battery pack, the switch being operated by the electronics.