Spotlight problems

To: "birding aus" <>
Subject: Spotlight problems
From: "Billinghurst, David (CRTS)" <>
Date: Sun, 15 Dec 2002 22:32:04 +1100
This is a safety feature of some battery chargers.  It make it difficult to:
 - charge a 6V battery with a 12V charger
 - get a dead short across the charger leads
 - attach the charger with reverse polarity (back the front)
These are good things.
The down side is that you can't charge a dead flat battery.
-----Original Message-----
From: Allan Benson [
Sent: Saturday, 14 December 2002 12:24 PM
To: birding aus
Subject: [BIRDING-AUS] Spotlight problems

I have a sealed lead/acid  12V rechargeable battery that I use to power my spotlight. It should provide about an hours use before going flat but it conked out after ten minutes and I wasn't able to recharge it.
I took it back to Battery World and they  found  no problem with the battery or the recharger.  After a long conversation with the very helpful salesperson I discovered the plug in recharger will not or will have trouble recharging the battery if the charge in the battery has less than about 10 V charge remaining.  This means that once the spotlight starts to dim it is wise to stop using it and recharge the battery. I had run down the battery thinking the battery had "memory".  I know now that this concept only applies to nicad type batteries.
Battery World were able to fully recharge the battery so hopefully there will be no further problems.
PS Battery World can supply a battery with "cigarette lighter" adaptor and carry case for about $80.
Allan Benson
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