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Napa 90-640 - User Manual

Napa 90-640
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1. IMPORTANT SAFETY INSTRUCTIONS – SAVE THESE INSTRUCTIONS
1.1 SAVE THESE INSTRUCTIONS – This manual contains important safety and operating instructions.
1.2 Keep out of reach of children.
1.3 Do not expose the charger to rain or snow.
1.4 Use of an attachment not recommended or sold by the battery charger manufacturer may result in a risk
of re, electric shock or injury to persons.
1.5 To reduce the risk of damage to electric plug and cord, pull by the plug rather than the cord when
disconnecting charger.
1.6 An extension cord should not be used unless absolutely necessary. Use of improper extension cord
could result in a risk of re and electric shock. If an extension cord must be used, make sure:
• The pins on plug of extension cord are the same number, size and shape as those of plug on charger.
• The extension cord is properly wired and in good electrical condition
• The wire size is large enough for AC ampere rating of charger as specied in section 8.
1.7 Do not operate charger with damaged cord or plug – replace the cord or plug immediately.
1.8 Do not operate charger if it has received a sharp blow, been dropped, or otherwise damaged in any way;
take it to a qualied serviceman.
1.9 Do not disassemble charger; take it to a qualied serviceman when service or repair is required. Incorrect
reassembly may result in a risk of electric shock or re.
1.10 To reduce risk of electric shock, unplug charger from outlet before attempting any maintenance or
cleaning. Turning off controls will not reduce this risk.
1.11 WARNING: RISK OF EXPLOSIVE GASES.
a. WORKING IN VICINITY OF A LEAD-ACID BATTERY IS DANGEROUS. BATTERIES GENERATE
EXPLOSIVE GASES DURING NORMAL BATTERY OPERATION. FOR THIS REASON, IT IS OF UTMOST
IMPORTANCE THAT YOU FOLLOW THE INSTRUCTIONS EACH TIME YOU USE THE CHARGER.
b. To reduce risk of battery explosion, follow these instructions and those published by battery manufacturer
and manufacturer of any equipment you intend to use in vicinity of battery. Review cautionary markings
on these products and on engine.
2. PERSONAL SAFETY PRECAUTIONS
2.1 Consider having someone close enough by to come to your aid when you work near a lead-acid battery.
2.2 Have plenty of fresh water and soap nearby in case battery acid contacts skin, clothing, or eyes.
2.3 Wear complete eye protection and clothing protection. Avoid touching eyes while working near battery.
2.4 If battery acid contacts skin or clothing, wash immediately with soap and water. If acid enters eye,
immediately ood eye with running cold water for at least 10 minutes and get medical attention immediately.
2.5 NEVER smoke or allow a spark or ame in vicinity of battery or engine.
2.6 Be extra cautious to reduce risk of dropping a metal tool onto battery. It might spark or short-circuit
battery or other electrical part that may cause explosion.
2.7 Remove personal metal items such as rings, bracelets, necklaces, and watches when working with a lead-
acid battery. A lead-acid battery can produce a short-circuit current high enough to weld a ring or the like to
metal, causing a severe burn.
2.8 Use charger for charging 6V and 12V LEAD-ACID (STD or AGM) rechargeable batteries. It is not intended to
supply power to a low voltage electrical system other than in a starter-motor application. Do not use battery
charger for charging dry-cell batteries that are commonly used with home appliances. These batteries may
burst and cause injury to persons and damage to property.
2.9 NEVER charge a frozen battery.
Automatic Battery Charger
OWNERS MANUAL
PLEASE SAVE THIS OWNERS MANUAL AND READ BEFORE EACH USE.
This manual will explain how to use the charger safely and effectively.
Please read and follow these instructions and precautions carefully.
0099002228-01
FOR MODELS
90-620
90-640

Table of Contents

Questions and Answers

  • M
    Matthew JonesAug 15, 2025
    What to do if Napa 90-640 Battery Charger will not turn on?
    • G
      garciajamesAug 15, 2025
      If your Napa Battery Charger won't turn on even when properly connected, check the AC outlet for an open fuse or circuit breaker. Also, inspect the power cord and any extension cords for loose connections. Finally, have the battery checked to ensure it is not defective.
  • R
    robinsoncolleenAug 18, 2025
    Why doesn't engine start work on my Napa 90-640?
    • E
      epriceAug 18, 2025
      If your Napa Battery Charger's engine start function isn't working, several factors could be at play. You might be drawing more current than the engine start rate allows. Ensure you wait the full 3 minutes (180 seconds) between cranking attempts, allowing the charger to cool down. Overheating can also cause this issue, so check that the charger vents are not blocked. If the battery is severely discharged, try using the boost rate for 10-15 minutes before attempting to crank the engine.
  • T
    Tony RossAug 21, 2025
    Why is my Napa Battery Charger not maintaining battery charge?
    • R
      Richard CoxAug 21, 2025
      If your Napa Battery Charger couldn't keep the battery fully charged in maintain mode, first ensure there are no loads draining the battery. If there are, remove them. If there are no loads, it is possible the battery is bad and should be checked or replaced.
  • P
    Phillip KingAug 25, 2025
    What to do if Napa 90-640 voltage drops too low during maintain mode?
    • N
      natalie41Aug 25, 2025
      If your Napa Battery Charger detects that the battery voltage dropped too low during maintain mode, ensure that there are no loads on the battery. If any exist, remove them. If there are no loads, the battery may be faulty and should be checked or replaced.
  • H
    hpughAug 27, 2025
    Why does my Napa 90-640 shut off due to high temperature?
    • A
      Andrew YangAug 27, 2025
      If your Napa Battery Charger shuts off because its internal temperature exceeds the limit, make sure that the side ventilation holes are not blocked. Move the charger out of direct sunlight and into a shaded area to help it cool down.
  • D
    Daniel CooleyAug 30, 2025
    What to do if Napa 90-640 detects thermal runaway?
    • E
      Erin HarringtonAug 30, 2025
      If your Napa Battery Charger indicates the battery may be getting too hot (thermal runaway), have the battery checked or replaced to prevent potential hazards.
  • C
    Carol TurnerSep 2, 2025
    How to fix reversed battery connections on Napa 90-640?
    • D
      Dustin ColeSep 2, 2025
      If your Napa Battery Charger shows that the connections to the battery are reversed, unplug the charger immediately and reverse the connections to the battery to ensure correct polarity.
  • C
    Caleb RussellSep 5, 2025
    Why won't my Napa 90-640 fully charge the battery?
    • M
      Michael MartinSep 5, 2025
      If your Napa Battery Charger fails to bring the battery to a full charge, it might be due to using too low of a current setting for a large battery or battery bank. Try charging again with a higher current setting. If the problem persists, have the battery checked or replaced.
  • J
    Jason NelsonSep 8, 2025
    What to do if Napa 90-640 cannot desulfate battery?
    • R
      Robert StricklandSep 8, 2025
      If your Napa Battery Charger can't desulfate the battery, it means the battery could not be desulfated. In this case, have the battery checked or replaced.
  • D
    danieljohnstonSep 12, 2025
    What to do if Napa Battery Charger voltage is too low after charging?
    • J
      jodybradleySep 12, 2025
      If the battery voltage is still under 10V (for a 12V battery) or 5V (for a 6V battery) after 2 hours of charging with your Napa Battery Charger, the battery could be bad. Have it checked or replaced.

Summary

Important Safety Instructions

Risk of Explosive Gases

Warning about explosive gases during battery operation and precautions.

Personal Safety Precautions

General Safety

Precautions for personal safety, eye protection, and avoiding sparks near batteries.

Preparing to Charge

Battery Preparation

Charger Location

DC Connection Precautions

Connection Safety

Follow These Steps When Battery Is Installed in Vehicle

Connecting to Vehicle Battery

Step-by-step guide for connecting the charger to a battery installed in a vehicle.

Follow These Steps When Battery Is Outside Vehicle

Connecting External Battery

Instructions for connecting the charger to a battery outside the vehicle.

Grounding and AC Power Cord Connections

Electrical Connections

Control Panel

Rate Selection Modes

LED Indicators Overview

Operating Instructions

Charging a Battery in Vehicle

Steps for charging a battery while it is installed in a vehicle.

Charging a Battery Outside Vehicle

Instructions for connecting the charger to a battery outside the vehicle.

Charging Modes Explained

Maintaining a Battery

Using the Engine Start Feature

Engine Start Procedure

Step-by-step guide to using the engine start feature for jump-starting a vehicle.

Engine Start Sequence States

Power-Up Auto-Start

Using the Battery Voltage Tester

Voltage Testing Procedure

Using the Alternator Performance Tester

Alternator Testing Procedure

Steps for testing the vehicle's alternator performance using the charger.

Troubleshooting and Error Codes

Error Code Descriptions

List of error codes, their descriptions, and possible solutions.

General Troubleshooting

Common problems, their causes, and solutions for charger operation.

Napa 90-640 Specifications

General IconGeneral
BrandNapa
Model90-640
CategoryBattery Charger
LanguageEnglish

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