Manual
Enerdrive ePOWER B-Tec Lithium Battery- Owners Manual (Rev. 3.01)Page 12
The ePOWER B-TEC batteries internal management system (BMS) monitors and optimize each single
prismatic cell within the battery during charge & discharge. However the BMS does not have the ability
of making a physical connection to a second BMS system for balancing of the cells between each battery.
So bottom line;
Can I parallel connect the ePOWER B-TEC lithium batteries?
The short answer is yes. BUT as described above, overall performance of the battery pack and life
expectancy will be reduced.
• EPL-100BT-12V: If you are requiring a battery system larger than 100Ah, please look at the Enerdrive
ePOWER 125Ah Lithium battery or the Enerdrive Lithium Power Pack.
• EPL-125BT-12V: If you are requiring a battery system larger than 125Ah, please look at the Enerdrive
Lithium Power Pack Systems which can oer this level of cell balancing protection.
Q: Can I series connect the ePOWER B-TEC batteries to increase the voltage?
A: The battery is not designed to series connect extra batteries to increase the overall voltage.
In series connected batteries, charging and discharging is inherently limited to the condition of the
‘weakest’ cell. This is particularly so with lithium-iron (LiFePO4) batteries.
A weaker cell would cause an imbalance. A weak cell may not fail immediately but will get exhausted
more quickly than the strong ones when under load. On charge, the low cell lls up before the strong
ones because there is less to ll and it remains in “over-charge” longer than the others. On discharge,
the weak cell empties rst and gets hammered by the stronger cells. Cells in multi-packs must be
matched, especially when used under heavy loads.
Again, the chances of nding two ePOWER B-TEC batteries o the shelf, with exactly the same individual
cell capacity in each battery would be near impossible.
So bottom line;
Can I series connect the ePOWER B-TEC lithium batteries?
The short answer is no. Early failure of the battery pack is virtually guaranteed due to the mismatch
in cell capacities.
If you are requiring a battery system of 24v or higher, please look at the Enerdrive Lithium Power Pack
Systems which can oer this level of cell balancing protection.
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