12V 100AH Marine Lithium Starting Battery


Millertech Starting Batteries meets and exceeds any charging or cranking requirements actually needed to work with the Mercury 4 stroke up to 250hp. We have many customers using them to start there motors since 2016 with no issues.


Voltage 12.8V
Weight 36 lbs
Dimensions 13 × 6.5 × 8.5 in
Capacity 100AH
Chemistry LiFePo4
Efficiency 98%
Memory None
Terminals M8
Max Charge/Voltage 14.6V
Peak Discharge 300A-5 sec
Cut-off Voltage 10.5V
Max charge/Discharge Current 100A
Cold Cranking Amps (CCA) 1150A
Operating Temp 32F – 130F
Cell Type Cylindrical
Group Size 32
Warranty 5 years



WARRANTY: More tech energy solutions warrants each MillerTech branded battery sold by MillerTech or any of its authorized dealers or distributors worldwide, to be free of defects for a period of five years from the date of sale. Within the warrantied timeframe, subject to the issues listed below, manufacturers will repair or replace the battery and or parts of the battery if the components in question are defective in materials or workmanship. Batteries are designed to replace lead acid batteries and should be used as drop-in replacements for lead acid applications.

NOT COVERED BY THIS WARRANTY: The manufacturer is not obligated to warrant the battery in question if defects are related to damages caused by abuse, neglect, or from the following:

  • * Damage from shipping, loose terminal bolts, or corroded hardware.
  • * Manufacturer codes tampering or removal
  • * Failure to properly install the battery, in addition to keeping the battery properly charged and maintained.
  • * Breakage from collision, fire, or freezing which includes damage from extreme heat or cold, improper storage, water damage, or tampering.
  • * A defective (SOC) meter will not affect the performance of the lithium battery, therefore the (SOC) meter is not covered by the MillerTech warranty.
  • * The warranty does not cover a battery reaching its normal end of life which may occur prior to the warranty. As stated above. Depending on the application a battery can reach its normal life before the end of the applicable warranty period. A battery can deliver only a fixed number of usable amp-hours over its lifetime and is considered to have reached its normal end of life if the application used up all of those amp-hours, regardless of the time the battery has been in service. Therefore manufacturer reserves the right to deny a warranty claim if it determines the battery to be at its normal end of life, even if the claim is lodged within the applicable warranty period.


EMAIL:  warranty@millertechenergy.com

If it is determined that your battery requires further inspection, arrangements will be made to ship it to the MillerTech manufacturing site. Proof of purchase is required and should include the original invoice and serial number.

Customer Reviews

Based on 3 reviews
Josh Hinkle
Starting Battery

Quick shipping and very well built battery.

David W. Covell
Beyond Satisfied!

I ordered my Millertech 12V 100 AMP cranking battery on a Thursday afternoon
and it was UPS delivered on Saturday! One and a half day delivery is what I call service! Many Many Thanks!

Frank Scalish
12V 100 amp HR

I run all Millertech batteries in my boat and I run them hard! One thing I will say is forget all day power.. it’s more like power for DAYS! I can fish for 3 days on a single charge! I’ll never run different battery in my boat! The only thing better than their batteries is the staff over there at Millertech, Shaun and the guys are second to none! So thank you Millertech!

What the pros are saying about Miller Tech batteries

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