How long does a Seiko Kinetic hold a charge?

Two answers circulate. One says a Kinetic runs six months on a charge. The other says it dies in a drawer within days. Both are true, of different watches or different charge levels. Six months is the full-charge figure for the 5M calibers; days is what a capacitor-era watch, or any Kinetic put away after a short charge, delivers. Below, the figures from Seiko's English instruction manuals for 17 Kinetic calibers are set side by side, along with what Seiko says about the warning signs and the storage cell.

The full-charge figure, caliber by caliber

The caliber is the four characters before the hyphen in the case-back number.

Three things stand out. First, the capacitor calibers are a different class of watch: days, not months. Seiko's manuals for the 4M21, 3M22 and 5M42/5M43 all name a capacitor, and none of them runs more than about a week. The later manuals name a rechargeable battery or a "Kinetic E.S.U.", short for Kinetic Electricity Storage Unit, and the figures move into months.

Second, the 5M family is where "six months" comes from. Every 5M62, 5M63, 5M82, 5M83, 5M84, 5M85 and 5M65 manual we read prints "Approximately 6 months" under full charge, and the same 250 swings for one day.

Third, the 4-year figure is not a bigger cell but a power save that stops the hands, covered below.

What a day on the wrist puts back

This number decides whether your Kinetic is running when you pick it up. Seiko gives it as a guideline for 12 hours of continuous wear:

• 1M20: about one additional day. Worn 12 hours a day for a month, about one month of reserve.
• 5J22 and 7D46/7D48/7D56: about one and a half days. Worn 12 hours a day for a week, about 10 days of reserve.
• 7L22: about two days. Worn 12 hours a day for a month, two additional months.
• 9T82: about four days. Worn 12 hours a day for a week, a full charge.

The walking illustrations in the manuals put the same thing in distance: 280 m for a day on the 1M20, 400 m for a day on the 4M21, and 720 m for two days on the 5M62, 5M82, 5M85 and 5M65. Seiko adds that the "actual amount of power reserve differs from person to person", and a still arm charges nothing. Thirteen of the manuals we read say it outright: wear the watch daily for at least 10 hours.

So a 5M62 worn on weekdays and left on the dresser at weekends is living on what the weekdays put in, a day or two for each day worn, not on six months. A Kinetic that stops after a weekend off is, by Seiko's own figures, more likely undercharged than broken.

Read the indicator before you blame the cell

Most Kinetics show their reserve on demand. On the 5M62/5M63, 5M82 family and 5M85, press the button at 2 o'clock (best when the seconds hand is at 12) and the seconds hand runs forward:

Right after swinging, Seiko says, the indicator may misread; check again after 10 to 15 minutes. The Direct Drive models (5D22, 5D44, 5D88) have a dial hand instead that shows reserve up to about one month and, while you turn the crown, how much you are generating.

A watch that reads 30 seconds and still stops within weeks has a storage cell problem. One that reads 5 seconds has simply not been charged.

The two-second jump is the fuel light

When stored energy gets low, a Kinetic moves its seconds hand in two-second steps instead of one. This is Seiko's energy depletion forewarning, not a fault, and the watch keeps time accurately while it does it. What it means in hours depends on the caliber: about 24 hours on the 3M62 and the 5M62, 5M82 and 5M85 families, about 12 hours on the 5J22, 7D48, 7L22 and 9T82, about 6 hours on the capacitor 5M42/5M43 and about 3 hours on the capacitor 3M22 and 4M21. On the 9T82, a running stopwatch cuts that to 1 to 2 hours.

The fix: swing the watch until the hand returns to one-second steps, then keep going for a day or two of reserve.

How to charge a flat Kinetic

1. Swing it from side to side, twice a second, through an arc of about 20 cm. Seiko's manuals repeat that swinging faster or harder gives no extra benefit. The whirring is the rotor spinning.
2. Count. On the 5M family, 250 swings gives one day and the seconds hand returns to one-second steps; about 500 gives two days, which Seiko recommends. Other calibers are in the table above.
3. Set the time and date, then wear it. Do not try to fill it by hand. Seiko says it is "not necessary to charge the watch fully, as it is charged automatically while it is worn on your wrist."
4. On a Direct Drive, turn the crown clockwise until the indicator reaches the second mark above 0, about 6 hours of reserve. After several years untouched this can take 5 to 6 minutes.

Overcharge protection means extra swinging does no harm. A Kinetic stopped for a long time needs patience: the 5M62 Divers manual limits its instant-start to watches stopped less than a year, the 5M82 and 5M85 manuals give about 3 years, and past that Seiko says to keep swinging until the hand steps normally. Seiko's Kinetic manuals do not mention watch winders at all; if you are setting one up for an automatic instead, our answer on what TPD to set covers that.

Do not pull the crown to save power

Many owners pull the crown when putting a watch away and assume it saves power on a Kinetic. Seiko says the opposite. The 1M20 and 7L22 manuals say that with the crown pulled out "a large amount of current flows through the built-in IC", so it "will not save the energy but consume more energy than usual." The 4M21 manual says the same of its capacitor. On a battery quartz, pulling the crown is a sensible economy. On a Kinetic it is the reverse.

The calibers that can save power do it themselves. The 5J22 and 5J32 Auto Relay stop the hands after about 72 hours with no movement, and can be put into power save by hand. The 7D46, 7D48 and 7D56 Perpetual stop the hands after about 24 hours. In both, the IC keeps time; four to six swings wake the watch and the hands run forward to the correct time. Fully charged, that "time relay" lasts about 4 years. The 5J22 manual adds a limit: if the watch keeps getting moved, so that power save never starts, a full charge lasts about 6 months. The perpetual calendar on the 7D keeps counting through the sleep.

Does the storage cell wear out?

Yes, gradually, and Seiko says both halves of that in the same breath. The 5M62 and 5M82 manuals say the rechargeable battery "does not require any periodical replacement", and a few lines later that "the duration of charge decreases gradually over time", which "varies depending on the environment and condition of use". The 7L22 manual says the same of its 5-month figure. Seiko gives no number of years.

The first of these watches, sold as the AGS from 1988 and renamed Kinetic in 1997, stored their charge in a capacitor, and Coronet's history of the system puts its replacement at roughly every 10 years. That figure is not Seiko's, and it describes the capacitor, not the rechargeable cells in the 5M and later calibers.

The test is the indicator, not the age. A watch that reads 30 seconds after a long charge and still runs down in days needs its storage unit replaced. That is a service job: our pages on service costs and servicing and care cover what a quartz service involves. The manuals carry the same warning: never fit an ordinary silver oxide battery in place of the Kinetic cell, which can burst, overheat or catch fire. Our answer on watch cell sizes is for battery quartz only.

How that compares with solar and automatic

A Kinetic stores far more than an automatic, whose power reserve is usually 38 to 80 hours, and charges the same way: by motion. An Eco-Drive or Seiko Solar charges from light instead, so for those the question is light, not wear. The timekeeping is ordinary quartz: the Kinetic manuals give less than 15 seconds a month at 5 to 35°C, the same as in our answer on quartz accuracy. If you are still deciding between the Seiko and Citizen ways of doing this, our Eco-Drive and Seiko Solar comparison and our answer on what does and does not have a battery are the next stops.

When this answer stops applying

• Your caliber is not in the table. The table covers the 28 Kinetic entries in Seiko's English manual library, which share 17 distinct manuals. For any other caliber, look up its own manual by the four-character number.
• The watch is not a Seiko. ETA's Autoquartz and other makers' generator watches charge the same way but publish their own figures.
• The watch has been serviced with a non-original cell. The manual figures assume Seiko's storage unit.
• It is in heat. The Direct Drive and Perpetual manuals give an operating range of -10 to +60°C; our answer on what temperature a watch can withstand covers where that matters.

For everything else: about 6 months on a full 5M, days on a capacitor, 4 years asleep on an Auto Relay, 250 swings for a day, and 10 hours a day on the wrist to stay ahead.