Manual
www.enerdrive.com.au Page 11
6 STORAGE & TRANSPORTATION
Based on the character of the cells, proper environment for transportation of LiFePO4 battery packs
need to be created to protect the battery.
•
Battery should be stored where it’s dry, clean, shaded and well-ventilated at a temperature between
-20°C to 35°C
• The battery should be stored at approx 50% SOC during transportation.
• The battery needs to be charged every 6 months if in an unused situation
• Keep the top of the battery and its terminals clean
• Protect the battery from being dropped, turning over and serious stacking during loading.
7 FREQUENTLY ASKED QUESTIONS:
Q: Can I parallel the ePOWER B-TEC batteries to increase the capacity?
A: The battery is not designed to parallel connect extra batteries to increase the overall capacity.
When manufactures of lithium cells build batteries, careful consideration is taken to choose matching
cells to build the battery pack. The batteries are assembled by the manufacture that is experienced and
certied to test and assemble battery packs. The individual cells are tested and sorted by machine so
that each ePOWER B-TEC battery pack has matching cells with the same capacity and internal resistance.
Paralleling individual lithium batteries like the ePOWER B-TEC unit is like taking out a lottery ticket.
There is a million to one chance that you would end up with two lithium batteries o the shelf at your
local retailer with exactly the same capacity & resistance.
When assembling lithium-ion cells into functional
battery packs, it is common to connect multiple
cells in parallel. When lithium ion battery packs are
connected in parallel and cycled, matching of internal
resistance is important in ensuring long cycle life of
the battery pack. Specically, a 20% dierence in cell
internal resistance between two battery packs cycled
in parallel can lead to approximately 40% reduction
in cycle life when compared to two batteries parallel-
connected with the same internal resistance.
Internal resistance mismatch becomes an important
problem for applications where the lithium battery
packs are paralleled and subjected to high C rates,
(i.e. large inverter loads and moderate to high charge
rates) and are also required to have a long cycle life.
The detrimental eect of internal resistance mismatch between parallel-connected batteries arises
because dierences in internal resistance lead to uneven current distribution and capacity between
the batteries, resulting in a decrease in battery pack life and performance.