Factory new 18650 LiFePO4 battery cell 4S27P li-ion 12.8v 40ah battery pack



1.Do not throw battery into water or make it wet;
2.Keep the battery away from heat source(like fire or heater);
3.Do not throw the battery into fire or heat the battery;
4.Forbid to hammer to trample the battery;
5.Forbid disassembling the battery in anyway



18650 LiFePO4 battery cell 4S27P li-ion 12.8v 40ah battery pack
widely used  for Home energy storage application, combine with Solar system is a great option for places withou electric or lacks of electric. Lifepo4 battery with long life cycle, up to 2000 times still remains 80% energy. It really economic choice.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]Battery Quality of 18650 LiFePO4 battery cell 4S27P li-ion 12.8v 40ah battery pack

1.Cells: A grade 18650 lifepo4 battery cells to make sure batteries in high and full capacity.

2.Protection: Dual IC chips, that can anti-shortcircuit, anti-overcharger, anti-overcurrent, anti-overload.

3.Compose Type: Injection Technology to make battery more stable.

4.Long cycle life, No memory effect, environmental friendly.


1. 12.8v 40ah battery pack with High energy density

2. High working voltage for single battery cells

3. Pollution-free

4. Long cycle life

5. 12.8v 40ah battery pack No memory effect

6. Capacity, resistance, Voltage, platform time consistency is good

7. With short-circuit production function, safe and reliable

8. High quality but with lower price

9. Good consistency, low self discharge

10. Light weight, small size


1. 4S27P li-ion battery with Longer storage life than NiMH Batteries.

2. Light weight and higher energy density than any rechargeable battery.

3. Installed IC chip will prevent the battery pack from over charge and over discharge. this helps protect battery chemistry integrity and prolongs battery life.

4. Perfect for building up battery pack for medical equipment Back-up or EPS Emergency Power.

5. Supply which requires compact size and lighter weight.

6. The battery module is wrapped by PVC.

7. strictly test before delivery.

Items Specifications
Type Lithium ion battery
Nominal voltage 12.8V
Nominal Capacity 40Ah
Dimension customized
Weight Approx: 5kg
Max.charge current 1.0C
Max.discharge current 3.0C
Charge current Standard Charging: 0.5C

Rapid charge: 1.0C

Standard Charging method 0.5C CC(constant current)charge,

then CV(constant voltage)charge till

charge current decline to ≤0.05C

Charging time Standard Charging: 2.75 hours(Ref.)

Rapid charge: 2 hours(Ref.)

Cycle life >2000 times
Operating temperature Charging: 0 °C ~+60 °C

Discharging: 0 °C ~+60 °C

Storage temperature -20°C~+60 °C
[/vc_column_text][/vc_column][/vc_row][vc_row full_width=”stretch_row” parallax=”content-moving” css=”.vc_custom_1436530001615{padding-top: 100px !important;padding-bottom: 50px !important;background-color: #499b7a !important;}”][vc_column width=”1/2″][vc_custom_heading text=”About Coremax” font_container=”tag:h2|text_align:left|color:%233f3f3f” use_theme_fonts=”yes” css=”.vc_custom_1496765176578{padding-bottom: 10px !important;}” link=”url:http%3A%2F%2Fwww.coremax-tech.com|title:About%20us|”][vc_column_text]Coremax Technology is a leading manufacturer of lithium ion battery with more than 10 years history in China. The main products are rechargeable polymer battery, 18650 battery pack, e-bike battery, lithium battery packs and customized battery projects. Coremax provide one-step solution and whole series products from batteries to battery components as customers’ requirements. Products have passed the certifications included ISO9001, UL, CE, CB, KC, MSDS, UN38.3 and so on. Coremax ensure that all customers enjoy high quality, best price, fast delivery, and good service.[/vc_column_text][vc_btn title=”Read More” style=”outline” shape=”square” color=”white” align=”left” link=”url:http%3A%2F%2Fwww.coremax-tech.com|title:About%20us|”][/vc_column][vc_column width=”1/2″][vc_single_image image=”15067″ img_size=”full”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

What We DO

[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column width=”1/3″][vc_custom_heading text=”Lithium ion Battery and Battery Packs” font_container=”tag:h3|text_align:left” use_theme_fonts=”yes” css=”.vc_custom_1496765760416{margin-top: 0px !important;}”][vc_column_text css=”.vc_custom_1496766361469{margin-bottom: 15px !important;}”]Provide different capacity and voltage to meet requirment from different industry. With Coremax Self developed BMS, the battery pack will work in a very good condition on charging and discharge.[/vc_column_text][/vc_column][vc_column width=”1/3″][vc_custom_heading text=”Lithium Polymer Battery and Packs” font_container=”tag:h3|text_align:left” use_theme_fonts=”yes” css=”.vc_custom_1496765789379{margin-top: 0px !important;}”][vc_column_text css=”.vc_custom_1496766095706{margin-bottom: 15px !important;}”]Lithium polymer battery is widely apply with portable products like GPS,PDA, E-book ,PMP, PSP, portable medical device and also Illuminate Devices: Miner lamp, search light.[/vc_column_text][/vc_column][vc_column width=”1/3″][vc_custom_heading text=”Lithium Iron Phosphate Battery” font_container=”tag:h3|text_align:left” use_theme_fonts=”yes” css=”.vc_custom_1496766700224{margin-top: 0px !important;}”][vc_column_text css=”.vc_custom_1496766713557{margin-bottom: 15px !important;}”]Higher operating voltage of 3.2V and energy density. Higher discharge rate for more powerful devices: Stable discharge under various temperatures environmental conditions.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_empty_space][/vc_column][/vc_row][vc_row][vc_column width=”1/3″][vc_single_image image=”15072″ img_size=”full”][/vc_column][vc_column width=”1/3″][vc_single_image image=”15071″ img_size=”full”][/vc_column][vc_column width=”1/3″][vc_single_image image=”15066″ img_size=”full”][/vc_column][/vc_row][vc_row][vc_column width=”1/2″][vc_single_image image=”15114″ img_size=”full”][/vc_column][vc_column width=”1/2″][vc_single_image image=”15115″ img_size=”full”][/vc_column][/vc_row]

Trusted by some of the biggest brands


We’re Waiting To Help You

Get in touch with Coremax today and let’s start your lithium battery project by our battery pack engineers

Book A Consultation