The POCKET STATION 7 is a 7 Amp-Hr gel cell reduced lead-acid battery with a soft cordura case and carrying strap. It will provide power for radios (AM/FM, walkie talkies, QRP, Mobile), laptop computer, cellular phones or just about anything that will plug into a cigarette lighter.
Unlike a ni-cad battery that has memory, you donít need to completely discharge the battery before recharging it. The POCKET STATION 7can be recharged when it is partially or completely discharged. This gives you the benefit of always being able to recharge your battery any time you wish. Therefore, the battery can always be "topped off" and ready for action or emergencies.
In addition to the supplied wall charger, the POCKET STATION 7 also has a cigarette lighter adapter for charging via the automobile. In this procedure the car regulator determines when the battery is at the proper voltage and ceases the charging cycle.
Price: $69.95 + $10.50 S&H
HOW MUCH LIFE CAN BE EXPECTED FROM A BATTERY?
If life was ideal, a 20 Amp-Hr battery would put out 20 Amps for 1 Hour, or 1 Amp for 20 hours before it was exhausted.
Rule #1 Life is not ideal.
Rule #2 All batteries, are measured over a 20 hour period (therefore, 1 Amp for 20 hours is correct). This is called the C20 rate, and the reason that you get a full 1 Amp x 20 hours for a 20 Amp-Hr battery
Rule #3 If a battery is discharged faster than the C20 rate, the capacity of the battery will be diminished. If you draw as many Amps as itís Amp-Hr rating (i.e. 20 Amps), it will last about 60% of an hour or 36 minutes at which point the battery will appear to be discharged. (Ignore the rest of this rule unless youíre a technoid). The interface at the Acid/Plates has been exhausted of the electrons faster than they could be replenished with those located within the plate. Youíll then walk away from the battery thinking itís dead, and return sometime later only to find out that some useful charge has "returned" to the battery. The reason is that those unused electrons have had time to migrate to where the interface occurs, so the battery has "come back to life"., but 20 Amps for only 36 minutes.
Rule #4 DONíT LEAVE A BATTERY COMPLETELY DISCHARGED FOR ANY LENGTH OF TIME OR IT WILL BE DAMAGED. When in doubt, top it off!
Rule #5 Donít overcharge a battery such as a POCKET STATION or POCKET GENERATOR by leaving it hooked up to a wall charger for months at a time unless it has a regulator. Our POWER STATION has such a regulator, but to save weight and size, the POCKET STATIONS and POCKET GENERATOR do not have an internal regulator for the wall charger
Rule #6 THEY CAN BE LEFT PLUGGED INDEFINITELY INTO THE CAR FOR CHARGING! Due to the fact that they are in parallel with the car battery and the cars has a battery regulator, a battery would not experience overcharging. HOW MUCH LIFE CAN BE EXPECTED FROM A BATTERY for an HF RIG?
Rule #7 Even though your HF rig states 20 Amps during transmit this occurs only during voice peaks on SSB, it averages only about 6 amps for transmit when you look at the area under the current vs. time curve. Define the current during TX as 6 Amps, and during RX as 1.5 Amps or 3/2 Amp.
Example: During an hour you talk for 20 minutes (i.e. 1/3 of the time or 1/3 Hr.) and listen for 40 minutes (2/3 Hr). Amp-Hrs for TX + Amp-Hrs for RX = Total Amp-Hrs used for 1 Hr of operation Current AVG Tx x Time + Current AVG R x Time = Amp-Hr Required 6 Amps (Avg) x 1/3 Hr + 3/2 Amps (AVG) x 2/3 Hr = ?Amp-Hr 2 Amp-Hr + 1 Amp-Hr = 3 Amp-Hr So you can easily run an HF rig for a few hours with a POWER STATIONM or POCKET STATION 7.