Ionic IC-12V40-S9
The Ionic IC-12V40-S9 is a battery pack with 512Wh of energy, LiFePO4 cells and a weight of 6.85 kg.
Last updated: 26 October 2026
Battery and charging
- Maximum charge voltage
- 14.6 ± 0.1V
- Energy
- 512Wh
- Chemistry
- LiFePO4
- Rated charge cycles
- 3,000 @ 80% DOD
- Case material
- ABS
- Internal resistance
- ≤50 mΩ @50% SOC
- Recommended charging
- 40 A
- Maximum charge current, as the maker labels it
- 100 A
- Efficiency
- 99%
- Cold cranking amps
- 1,000A (3 sec)
- Float voltage
- 13.9 ± 0.1V
- Voltage it cuts off at
8.0V
lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery · retrieved 10 October 2026
“Discharge Cut-Off Voltage 8.0V Output Voltage Range 8.0”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
11 V
starter-battery-40ah-spec-sheet.pdf · retrieved 10 October 2026
“Cold Cranking Amps 1,000A (3 sec) Recommended Low Voltage Cut-Off 11 V”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
- How fast it loses charge sitting idle
- <3% per Month
Row from the maker’s page: “Max Charge Voltage” | “14.6 ± 0.1V”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
“Nominal Capacity 40Ah (512Wh)”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
Row from the maker’s page: “Chemistry” | “LiFePO4”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
Row from the maker’s page: “Cycle Life” | “3,000 @ 80% DOD”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
“Terminal Torque 80 - 100 in-lbs (9 - 11 N-m) Case Material ABS”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
“Resistance ≤50 mΩ @50% SOC”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
“Recommended Charge Current 40 A”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
“Recommended Charge Current 40 A Maxiumum Charge Current 100 A”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
“Resistance ≤50 mΩ @50% SOC Efficiency 99%”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
“Cold Cranking Amps 1,000A (3 sec)”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
“Recommended Float Charge Voltage 13.9 ± 0.1V Discharge Cut-Off Voltage 8.0V”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
The maker’s own documents give different figures
“Self Discharge <3% per Month”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
Battery care and safety
- Where its BMS cuts off
- 8 V
- Operating temperature range
- -4 to 140°F
- Temperature it reconnects at
- 122°F (50°C)
- Temperatures it may be charged in
- -4 to 113°F (-20 to 45°C)
- Temperatures it may be run in
- -4 to 140°F (-20 to 60°)
- Temperatures it may be stored in
- 23 to 95°F (-5 to 35°C)
“BMS Discharge Voltage Cut-Off 8 V”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
Row from the maker’s page: “Operating Temperature” | “-4 to 140°F”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
“Reconnect Temperature 122°F (50°C)”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
“Charge Temperature -4 to 113°F (-20 to 45°C)”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
“Discharge Temperature -4 to 140°F (-20 to 60°)”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
“Storage Temperature 23 to 95°F (-5 to 35°C)”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
Size and fit
- Weight
- 6.85 kg
- Overall dimensions
- 9" (L) × 6.8" (W) × 7.4" (H)
- Torque for the battery terminal nuts
- 80 - 100 in-lbs (9 - 11 N-m)
- Terminals
- 3/8 thread posts
- Series and parallel connection
- 4
Row from the maker’s page: “Weight” | “15.11 lbs (6.85 kg)”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
“9" (L) × 6.8" (W) × 7.4" (H)”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
“Terminal Torque 80 - 100 in-lbs (9 - 11 N-m)”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
Row from the maker’s page: “Terminal Type” | “3/8 thread posts”
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
“Maximum Modules in Series 4”
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
Sources
- Archived document
Source: lithiumhub.com/wp-content/uploads/2023/03/starter-battery-40ah-spec-sheet.pdf
Retrieved October 10, 2026
- Archived document
Source: lithiumhub.com/product/lithium-12v-40ah-1400ca-lifepo4-marine-starter-battery
Retrieved October 10, 2026