Prepared date
Approved date
File number
S230XLP03
Page
10/24
Version
A
Example 3
If the battery string has 2 batteries in series and 2 batteries strings in parallel (2S2P),
the recommended charge voltage per battery is 14.6 V, and the recommended charge
current per battery is 10 A, then the charge current and charge voltage for the string is
10 A and 29.2 V: (2 batteries, series) x (14.6 V) = 29.2 V (2 batteries, parallel) 10 A
Table 2 Examples for Charging
Once you reach end-of-charge voltage, apply a constant voltage hold at this voltage until the
current decays to almost zero. This charges the batteries to 100% state of charge (SOC). Refer
to figure 6 for an illustration
Figure 6 Battery Voltage and Current During Recharge
5.2 Relationship Between Charge Limits and Temperature
Due to the chemistry of LiFePO4 cells, the
batteries
cannot accept as much charge current at
lower temperatures without risking permanent loss of capacity. As the cells’ temperature rises
during the charging process, they can gradually accept higher currents. To maintain optimum
performance and durability of the 12V, Drypower recommends the following charge limits
based on ambient temperature:
Temperature (
℃
)
Recommended Charge rate
0
≤
C/10
5
≤
C/5
10
≤
C/2
20
≤
1C(if applicable)
Table 3 Charge Rate by Temperature
12V Smart Battery
User Guide
