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Re: Sovereign and Excal battery information 101. We need all your information.
Posted by: Critterhunter
Date: June 29, 2012 11:45AM
Somebody will correct me if I'm wrong but as far as I know the Sovereign and Excal "chargers" don't shut off the current when the pack is charged. They might on the GT or Elite with the primative charging circuit found inside the pack, but I'm pretty sure older Sovereigns and the Excals don't have any circuit between the wall transformer and the battery? Either way, I wouldn't trust the GT and Elite's circuit inside the pack to be shutting down the current either myself.

The wall transformer is putting out so little current that it's actually refered to as a trickle charge in the battery industry. Here's the thing...When a NICAD pack is fully charged it does not hurt them to be constantly sitting on a trickle charge (so long as it's a very low current, thus called a trickle charge) while waiting to be used. However, what I've read on NIMH technology is that NIMHS should never be put on a trickle charge after they are fully charged as it will slowly destroy the battery. For that reason, many chargers out there that can do nimhs or nicads both have the option to turn on or off the trickle charge after the main charge is complete. In other words, the pack is charged at 1C for roughly a 1 hour charge, and then after that the charger will step down to a trickle charge rate of say 50ma or so. This is often refered to as a maintenance charge rate, meaning maintaining the battery at peak charge so that it's ready for action and has not been self discharging for weeks sitting on a shelf.

So, either way, I'm just warning you guys using at least the nimh packs. I wouldn't leave it on the stock charger in case the charging circuit in the Elite or GT isn't shutting off, but rather maintaning the constantly current put out by the wall transformer. That would be bad for a nimh pack from all I've read if it sits on that for days on end. For the Excal or say older Sovereigns, far as I know (?) there is no charging circuit between the wall transformer and the pack, so if you are using a nimh pack then I'd take it off when you think it's done. How to know? One way is to hook a volt meter up to the pack while it's charging. Write the voltage down and come back an hour later. Is the voltage any higher? Then it's still charging. Write it down and come back later. If the voltage is the same or has dropped after say an hour to two then the pack has reached it's peak, because when a nimh or nicad is fully charged the voltage actually drops a bit and then stops and stays at that. That's how a charger sees the pack is done charging and is called the m/v threshold setting on chargers that allow you to set the level of that for how much drop they want to see to stop charging. Normal charging will have dips and rises in voltage, so that setting has to be high enough to not false terminate from that, but not so high that the charger never sees the pack peak.

The other way to know when the pack is done is just to do the math....Capacity of the pack divided by the output current of the wall transformer. If the wall transformer says 100ma then a 1000ma pack would take 10 hours to charge if completely dead or so. Obviously after 10 hours you can be pretty darn sure the pack is charged. Or, if you use the Sovereign or Excal for 10 hours, figure it's amp draw is roughly around 50ma, so then you've taken about 500ma of capacity out of the battery. So if the wall transformer says it puts out 100ma (it's either that or 50 but I'm pretty sure it's 100ma output), then it would mean about 5 hours to put the capacity back into the pack that was taken out during the 10 hours of hunting.

I'll leave others to fill in more blanks on the stock chargers as I've said more than enough and don't want to mob the sticky more than I already have. Somebody should stick up a few links to places that will re-build battery packs for people who have a bad pack. Sorry again for the length of my two posts, but at least that should kill some future questions.



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SubjectAuthorViewsPosted

Sovereign and Excal battery information 101

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Re: Sovereign and Excal battery information 101

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Re: Sovereign and Excal battery information 101. We need all your information.

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Re: Sovereign and Excal battery information 101. We need all your information.

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Re: Sovereign and Excal battery information 101. We need all your information.

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Re: Sovereign and Excal battery information 101. We need all your information.

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