12V 20A On-Board Lithium Battery Charger (1220M)


IP65 Waterproof-rated Lithium battery chargers are built specifically to be permanently mounted in your boat.

  • Weight: 4.8lbs
  • Measurements: 8×5″.5″x5″

Input 110V AC
Output Voltage 14.5V
Output Current 20A
Waterproof IP65


Standard One Year Warranty:

MillerTech warrants this product to be free from defects in workmanship and materials, under normal use conditions, for one (1) year from the original invoice date.
Return shipping and handling fees are to be paid for by the customer. The manufacturer agrees, at its discretion during the
warranty period to repair, replace, or to furnish a repaired or refurbished
product of equal or greater value in exchange without charge. (except for return shipping costs)
Such repair or replacement is subject to verification of the product defect or malfunction and proof of purchase as confirmed by showing the
model number on original dated sales receipt.

This warranty does not include:
* Any condition resulting from other than ordinary residential wear or any use for which the product was not intended.
* Any condition resulting from incorrect or inadequate maintenance or care
* Damage resulting from misuse, abuse, negligence, reverse polarity, short circuits, loose connections, accidents or shipping damage
* Dissatisfaction due to buyer’s remorse
* Normal wear and tear
* Damages incurred during transportation
* Damages incurred during assembly or maintenance
* Any used or previously displayed items

Please retain invoices for a minimum of one year for warranty purposes.
* Claims for defective merchandise must be made within ONE year from invoice date.
* Claims for missing parts must be made within 60 calendar days after the merchandise is received
* Any claim for defective merchandise returns must be packed in original packaging
* We reserve the right to specify that items be returned to the original warehouse for inspection or be inspected by our representative in the field
* Pictures are beneficial to claim defective merchandise, along with a copy of the original invoice
* If the claim is justified, the item(s) or part(s) will be repaired or replaced with a similar product that has an equal or higher value than the original product.
* It is our policy to replace parts whenever possible
* This warranty gives you specific legal rights. You may have other rights, which vary from state to state.

Warranty Claim Contact:
Phone: 855-629-5484 (8am – 4pm EST)
Email: [email protected]
MillerTech Energy Solutions LLC
Lester Miller / General Manager

Customer Reviews

Based on 8 reviews
60ah/36v and 135ah/12v purchase

I must say it feels weird removing the 31 series X2 and three other 31 series AGM to swap out with two batteries that combined weigh the same as one AGM. Going out on the water and testing over a few trips so far and it's amazing the capacity of these batteries. The total purchase has been amazing. Quick response to my email questions and shipping same day I placed the order. Looking forward to the upcoming season.

Caleb Meadows
12v 20a

Easy install and super easy to operate. The led light on the side helps to know when battery is fully charged if you dont use the app. Will by again from MillerTech as I add more lithium batteries.


Great battery charger so far! As advertised. Very high quality construction.

Edwin Rios

Charges fast great charger will recommend it to anyone who asks

Nick Marsh
Awesome service

Quick easy ordering and the charger works perfect. Awesome company better people. Thanks!

What the pros are saying about Miller Tech batteries

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