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Battery Tender Plus - Design Changes

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kt77
Guest

Sat Feb 02, 2019 8:45 pm   



I have the latest version of the Battery Tender Plus and it terminates the constant voltage phase (Green LED Flashing) earlier than expected. The original design appears to have been an analog design and the manual showed the constant voltage phase ending when current declined to 0.1 amps. My tests on the new design show the constant voltage phase ending when the charge current has declined to 0.8 amps. Testing was done with an automotive battery in good condition.

Does the change from 0.1 amps to 0.8 amps sound like a concern? The manual refers to bulk mode, absorption mode, and float mode charging but no longer includes a specification or chart showing the current cutoff threshold.

I'd be interested if others have taken any measurements on either design. My device charges at 1.25 amps and the constant voltage phase starts when the voltage reaches 14.5 volts. The float voltage measures 13.1 volts.

Saturation might still be possible in float mode given enough time depending on the float voltage.

The latest design uses switching technology. The charger does appear to be more efficient with AC power measuring a maximum of 24 watts. The power level declines to 16 watts at the end of the constant voltage phase and then drops to a very low level in float mode.

triangles
Guest

Sun Feb 03, 2019 3:45 am   



On 02/02/2019 11:03 AM, kt77 wrote:
> I have the latest version of the Battery Tender Plus and it

I bought a Deltran Battery Tender Jr., 6 volt, years ago. It was
garbage, never got a single successful charge with it. Lifetime
"warranty" likewise garbage, shipping to Florida and the required fees
for handling, diagnosis, return shipping, etc. were near the retail
price of a new one. A sledgehammer that I made in High School metal shop
class took care of it.

Martin Riddle
Guest

Sun Feb 03, 2019 4:45 am   



On Sat, 2 Feb 2019 11:03:06 -0800 (PST), kt77 <kawill70_at_gmail.com>
wrote:

Quote:
I have the latest version of the Battery Tender Plus and it terminates the constant voltage phase (Green LED Flashing) earlier than expected. The original design appears to have been an analog design and the manual showed the constant voltage phase ending when current declined to 0.1 amps. My tests on the new design show the constant voltage phase ending when the charge current has declined to 0.8 amps. Testing was done with an automotive battery in good condition.

Does the change from 0.1 amps to 0.8 amps sound like a concern? The manual refers to bulk mode, absorption mode, and float mode charging but no longer includes a specification or chart showing the current cutoff threshold.

I'd be interested if others have taken any measurements on either design. My device charges at 1.25 amps and the constant voltage phase starts when the voltage reaches 14.5 volts. The float voltage measures 13.1 volts.

Saturation might still be possible in float mode given enough time depending on the float voltage.

The latest design uses switching technology. The charger does appear to be more efficient with AC power measuring a maximum of 24 watts. The power level declines to 16 watts at the end of the constant voltage phase and then drops to a very low level in float mode.


What is your battery voltage at rest without a surface charge?

Cheers

kt77
Guest

Sun Feb 03, 2019 8:45 pm   



On Saturday, February 2, 2019 at 7:07:13 PM UTC-8, Martin Riddle wrote:

> What is your battery voltage at rest without a surface charge?

The battery typically reads 12.5-12.7 VDC depending on the time since the last charge.

I do like the Battery Tender Plus better than my Black & Decker 2 amp charger/maintainer. The Battery Tender Plus does have three state charging and it also has temperature compensation. That is actually quite important over a wide temperature range. Temperature compensation typically requires a 0.18 volt change for every 10 degrees Centigrade for a 12 volt battery.

The Black & Decker charger appears to start out constant current and then switches to float after the voltage rises to about 14.2 volts. The float voltage has reached 13.68 volts in the summer which seems a little high.

The Battery Tender Plus has been charging at 14.5 volts in the constant voltage phase. That is not as high as an equalizing charge but still could provide some benefits.

It's possible that Battery Maintainers today have implemented changes to handle the multiple types of vehicle batteries now in use.

kt77
Guest

Tue Feb 19, 2019 9:45 pm   



There is an interesting update on this thread. My new Battery Tender Plus in earlier testing was ending the Constant Voltage Phase when current declined to about 0.8 Amps before going into Float mode. The original Linear Design was specified to end the Constant Voltage Phase at 0.1 Amps.

Last week I noticed the current at 0.29 Amps while doing a different type of test. The voltage measured 14.51 VDC. I don't know the final current before going into Float mode.

Any theories on what could have changed? I wonder if the algorithm includes other criteria.

The battery had been charged a number of times with the Battery Tender Plus and also a new CTEK Eight Step Charger. In both cases the battery was exposed to higher voltages than it sees in the vehicle which is typically 14.2 VDC or less.

The additional testing was measuring the current in Float Mode which was intended to get a feel for the parasitic drain from the vehicle. I measured current as low as 25-30 milliamperes after a long stabilization which should be a good sign. The parasitic drain from the vehicle should be less than the measured float current. This test requires a relatively low Float voltage for the best results to minimize charging current.

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