The operating voltage range of the MG2639 (3.4-4.2V) makes it an ideal
candidate for direct LiPo battery supply. The Shield can be powered
through a LiPo battery, but there are some adjustments you’ll need to make
to the bottom-side jumpers before doing so.
As a starting point, here is the schematic of the shield’s voltage regulator
and power input circuitry:
In order to power off a battery instead of the Arduino’s VIN pin (“VRAW” on
the schematic), you need to
cut SJ2
and
short SJ3
.
Jumper configuration for battery power. Cut SJ2, and short SJ3 (then clean
it up better than we did).
SJ2 will prevent the 3.8V regulator from supplying a competing voltage to
the battery. SJ3 will allow the battery to directly supply the MG2639.
To connect the battery to the shield, two connectors are broken out on the
top side of the board, labeled “BATT”. One connector is a footprint for our
2-Pin JST Connectors, which mates with our catalog of single-cell LiPo’s.
The other is a simple 0.1" 2-pin header.
LiPo batteries are a perfect power supply for the LiPo shield. Even better
when paired with a LiPo Charger Basic.
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