[sdiy] I’m Looking for a simple circuit that simulates this type of battery (12V 9AH)

Tom Bugs admin at bugbrand.co.uk
Mon Jul 3 11:55:49 CEST 2023

Possible idea worth a try, that I've used with NiMH batteries that 
appear not to charge.. I think it is called 'balancing'.
Connect the positive & negative terminals to those of a good battery - 
hold for a few seconds.

On 03/07/2023 10:08, Gordonjcp wrote:
> On Sun, Jul 02, 2023 at 03:49:29PM -0400, Jean-Pierre Desrochers wrote:
>> Hi list,
>> I have a battery charger circuit that I need to fix and do some tests on..
>> It is supplied from a 15VDC (22VDC actually) at 1.2amp and its job
>> is to charge a 12VDC 9AH battery for a small CRATE TAXI TX-50D portable guitar amplifier.
>> Its battery is done with a very high ESR value.. No recharging possible.
>> Now before I go buy a new one I’m Looking  for a simple circuit that simulates this type of battery (12V 9AH)
>> And will be connected to the battery terminals of my charger..
>> Any clue what this circuit would look like ?
> Why are you trying to simulate the battery? To test the charger? If it's a sealed lead acid battery it should be putting out about 14.4V, it won't need to be smoothed or regulated (real lead acid car battery chargers are just a transformer and a rectifier!), and it should output maybe an amp or so into a flat 9Ah battery, which will then charge overnight.
> A suitable dummy load would be a big wirewound resistor, or some 12V bulbs - a car tail lamp bulb draws about half an amp and an indicator bulb (or, the "brake" section of a dual-filament brake/tail lamp bulb) about 2A.
> Just change the battery, the charger will be fine.
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