Quote:Is there a link on how to replace the Celestron Powertank 17 internal battery?I cooked my battery after only a few uses!Here is a link to a picture of one Celestron Powertank 17[/url]
Quote:Thank you David and Randy!QUESTIONS FOR YOU BOTH:Is the term "Werker" a company or type of battery?Can I put a deep cycle battery in the Powertank?The Powertank is just so darn useful!
Quote:I'm going to respectfully disagree with Mr. Knisely. The original battery in the PowerTank I have was clearly not a "starter battery" it was a 17AH "standby" AGM. (which is more closely related to a "storage battery" than a starter). This is the same type of battery commonly used in "desktop UPS" devices, but the UPSes have much more sophisticated charging/maintenance circuits. These AGMs are also becoming very common in standby power supplies for telephone and other telecommunication systems, and (in a different form factor) even some really large "whole building" UPS systems.
Although the makers of the PowerTank (as well as the Coleman, Husky, Black & Decker, and several others) have attached "jumper cables" to them, they are NOT truly "starter batteries" which is why they caution that you shouldn't "crank" for more than 5 seconds at a time using these products. The plates just can't take the current demand of starting for an extended (some would say, "reasonable") period. If any thing, "starting" is the wrong application for these batteries. There ARE AGM starter batteries, these just aren't really them. "Starter AGMs" are much heavier.
The internal charger of the PowerTank is properly designed for just such a battery (voltage, current limiting, etc), unfortunately, however it does not have the latest technology (some would say the proper technology) for "maintenance" charging, thus the PT needs to be taken off charge as soon as it's fully charged.
The replacement "Werker" AGM ("Absorptive/Absorbed/Absorption Glass Mat" a/k/a "Starved Electrolyte") is very happy and reaches full charge with the 'stock' wall-wart supply and the PowerTank's internal charge circuit. (the charging circuitry is in the unit, not the "wall-wart")
Bottom line: The replacement Werker battery in my PowerTank has been working great for well over 3 years now, it goes out on just about every observing session, and a lot of ham radio field sessions. It gets recharged immediately after every use (unless it was VERY short term - less than 20 minutes), and it gets charged for not more than 24 hours every 3 months whether it's used or not.
Here's a good reference source.
Quote:Is there a link on how to replace the Celestron Powertank 17 internal battery?I cooked my battery after only a few uses!
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
Meade LX200R-8 Nexstar 6SE AT80EDTA on Minitower Lots of glass, aluminum, and plastic Arctic origin - http://www.youtube.com/watch?v=wAx58lIynfY&feature=player_embedded#! Weather station - http://classic.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KFLKENNE... 73s de KF4JU
Quote:Quote:Is there a link on how to replace the Celestron Powertank 17 internal battery?I cooked my battery after only a few uses! A couple of observations? First off, yes, you can find batteries to replace those in the Powertanks. The catch? They may be almost as expensive as a new Powertank.Best solution? Get a plain ol' jumpstart pack from Walmart (or Pep Boys or whatever). Unless it matters to you that the battery say "Celestron" or "Orion," the ones in Walmart are usually better deals. They often have more capacity (the last one I got is 22ah) for less money...and are often put on sale.How do you keep one alive? I have one that I bought at the same time I bought my NexStar 11 nearly 8 years ago, and it still works fine. It's branded "Prestone," but there is nothing special about it. The rules? No overcharging and no complete discharges have been mentioned, but what I've also adhered to strongly is:1. Charge for 12 hours after each use.2. If the battery wasn't used over the course of the month, charge it for 12 hours anyhow.If you do these things, one will last for years, not months.