#86658

开云体育

Folks,

?

My post from a different stream. It may help.

?

Folks,

?

A data sheet is usually a good start to avoid the “fake news”. This data extracted from .

?

Ambient Temperature:25±5℃; Relative Huimdity:65±20%

?

Nominal Voltage 3.7V? per cell

?

Standard Charge Constant Current and Constant Voltage (CC/CV)

Current = 0.52A ????????????? Final charge voltage = 4.2V Final charge Current = 0.052A

Standard Discharge Constant Current (CC)

?Current = 0.52A ????????????? End Voltage = 3.0V

?

A protection board is essential to avoid damage to the batteries and avoid fire.

?

3S 8A 12.6V
Size: 50mm x 16mm x 3.5mm (L x W x H)
Supported Battery type: three cell 4.2V Lithium ion battery
Overcharged Voltage protection: 4.35V
Over discharged Voltage protection: 2.7V
Maximum Continuous Current: 8A
Maximum Peak Current: 15A, <20ms
Internal resistance: <8mΩ
Operating temperature: -20 to 70°C

?

This board may also be used as a charger for a constant current power supply providing

Current (A) = Capacity of each cell (AHr) / (4 Hours)

?

However, an external purpose built lithium ion charge is recommended.

?

The maximum terminal voltage of 3 cells in series is 16.8 V. Two diodes will not keep the supply to the radio to under 13.8V. ?Also at a minimum voltage of 11.0V, only about half of the capacity of the battery will be used.

?

A low dropout regulator such as a LM1085IT-12 12V 3A Low Voltage Dropout Regulator. Again full battery capacity will not be available.

?

As a switching regulator 3A Mini DC-DC step down converter volt regulator 5V-23V to 3.3V 6V 9V 12V JCSE () ?or 5A Mini DC-DC Buck Step Down Converter Volt Regulator 4-38V to 3.3V 12V 24V Hot is likely to cause radio interference if fitted inside the radio, the battery, charger, protection board, and the regulator should be installed in metal shielded enclosure. Leads into and out of the box should ?be fitted with EMI filters (at least a 1nF bypass capacitor and ferrite bead (inside box)).

?

This solution allows the full capacity of the cells to be available. Extended capacity may be achieved by using 4 cells in series (with the appropriate charger / protection board.

?

Lithium polymer batteries as used in remote control planes and cars may also be used. Charging and protection settings must then be for lithium polymer not lithium ion.

?

Hope this helps.

?

73

?

George

??????????????? VK4AMG

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of Zvi Segal via groups.io
Sent: Thursday, 4 March 2021 12:57 AM
To: [email protected]
Subject: Re: [BITX20] Homebrew li-ion battery pack into ubitx

?

I did not read the whole thread.

However be careful not to overcharge lithium batteries.? ?Even 10mA at over voltage can cause them to burn.

The use if protection circuit and/or BMS snd/or dedicated balanced charges is highly recommend.
--
Zvika?
4Z1ZV

#86660

_._

Show quoted text

On Wed, Mar 3, 2021 at 2:16 PM <vk4amg@...> wrote:

Folks,
?
My post from a different stream. It may help.
?
Folks,
?
A data sheet is usually a good start to avoid the “fake news”. This data extracted from .
?
Ambient Temperature:25±5℃; Relative Huimdity:65±20%
?
Nominal Voltage 3.7V? per cell
?
Standard Charge Constant Current and Constant Voltage (CC/CV)
Current = 0.52A ????????????? Final charge voltage = 4.2V Final charge Current = 0.052A
Standard Discharge Constant Current (CC)
?Current = 0.52A ????????????? End Voltage = 3.0V
?
?
A protection board is essential to avoid damage to the batteries and avoid fire.
?
3S 8A 12.6V
Size: 50mm x 16mm x 3.5mm (L x W x H)
Supported Battery type: three cell 4.2V Lithium ion battery
Overcharged Voltage protection: 4.35V
Over discharged Voltage protection: 2.7V
Maximum Continuous Current: 8A
Maximum Peak Current: 15A, <20ms
Internal resistance: <8mΩ
Operating temperature: -20 to 70°C
?
This board may also be used as a charger for a constant current power supply providing
Current (A) = Capacity of each cell (AHr) / (4 Hours)
?
However, an external purpose built lithium ion charge is recommended.
?
?
?
The maximum terminal voltage of 3 cells in series is 16.8 V. Two diodes will not keep the supply to the radio to under 13.8V.? Also at a minimum voltage of 11.0V, only about half of the capacity of the battery will be used.
?
A low dropout regulator such as a LM1085IT-12 12V 3A Low Voltage Dropout Regulator. Again full battery capacity will not be available.
?
As a switching regulator 3A Mini DC-DC step down converter volt regulator 5V-23V to 3.3V 6V 9V 12V JCSE () ?or 5A Mini DC-DC Buck Step Down Converter Volt Regulator 4-38V to 3.3V 12V 24V Hot is likely to cause radio interference if fitted inside the radio, the battery, charger, protection board, and the regulator should be installed in metal shielded enclosure. Leads into and out of the box should ?be fitted with EMI filters (at least a 1nF bypass capacitor and ferrite bead (inside box)).
?
This solution allows the full capacity of the cells to be available. Extended capacity may be achieved by using 4 cells in series (with the appropriate charger / protection board.
?
Lithium polymer batteries as used in remote control planes and cars may also be used. Charging and protection settings must then be for lithium polymer not lithium ion.
?
?
Hope this helps.
?
73
?
George
??????????????? VK4AMG
?
?
From: [email protected] <[email protected]> On Behalf Of Zvi Segal via
Sent: Thursday, 4 March 2021 12:57 AM
To: [email protected]
Subject: Re: [BITX20] Homebrew li-ion battery pack into ubitx
?
I did not read the whole thread.

However be careful not to overcharge lithium batteries.? ?Even 10mA at over voltage can cause them to burn.

The use if protection circuit and/or BMS snd/or dedicated balanced charges is highly recommend.
--
Zvika?
4Z1ZV

#86666

开云体育

WE SAW IT ALREADY.?? SHEESH.

6 posts (so far)

On 3/3/21 4:15 PM, vk4amg@... wrote:

Show quoted text

Folks,

?

My post from a different stream. It may help.

?

Folks,

?

A data sheet is usually a good start to avoid the “fake news”. This data extracted from .

?

Ambient Temperature:25±5℃; Relative Huimdity:65±20%

?

Nominal Voltage 3.7V? per cell

?

Standard Charge Constant Current and Constant Voltage (CC/CV)

Current = 0.52A ????????????? Final charge voltage = 4.2V Final charge Current = 0.052A

Standard Discharge Constant Current (CC)

?Current = 0.52A ????????????? End Voltage = 3.0V

?

?

A protection board is essential to avoid damage to the batteries and avoid fire.

?

3S 8A 12.6V
Size: 50mm x 16mm x 3.5mm (L x W x H)
Supported Battery type: three cell 4.2V Lithium ion battery
Overcharged Voltage protection: 4.35V
Over discharged Voltage protection: 2.7V
Maximum Continuous Current: 8A
Maximum Peak Current: 15A, <20ms
Internal resistance: <8mΩ
Operating temperature: -20 to 70°C

?

This board may also be used as a charger for a constant current power supply providing

Current (A) = Capacity of each cell (AHr) / (4 Hours)

?

However, an external purpose built lithium ion charge is recommended.

?

?

?

The maximum terminal voltage of 3 cells in series is 16.8 V. Two diodes will not keep the supply to the radio to under 13.8V. ?Also at a minimum voltage of 11.0V, only about half of the capacity of the battery will be used.

?

A low dropout regulator such as a LM1085IT-12 12V 3A Low Voltage Dropout Regulator. Again full battery capacity will not be available.

?

As a switching regulator 3A Mini DC-DC step down converter volt regulator 5V-23V to 3.3V 6V 9V 12V JCSE () ?or 5A Mini DC-DC Buck Step Down Converter Volt Regulator 4-38V to 3.3V 12V 24V Hot is likely to cause radio interference if fitted inside the radio, the battery, charger, protection board, and the regulator should be installed in metal shielded enclosure. Leads into and out of the box should ?be fitted with EMI filters (at least a 1nF bypass capacitor and ferrite bead (inside box)).

?

This solution allows the full capacity of the cells to be available. Extended capacity may be achieved by using 4 cells in series (with the appropriate charger / protection board.

?

Lithium polymer batteries as used in remote control planes and cars may also be used. Charging and protection settings must then be for lithium polymer not lithium ion.

?

?

Hope this helps.

?

73

?

George

??????????????? VK4AMG

?

?

From: [email protected] <[email protected]> On Behalf Of Zvi Segal via groups.io
Sent: Thursday, 4 March 2021 12:57 AM
To: [email protected]
Subject: Re: [BITX20] Homebrew li-ion battery pack into ubitx

?

I did not read the whole thread.

However be careful not to overcharge lithium batteries.? ?Even 10mA at over voltage can cause them to burn.

The use if protection circuit and/or BMS snd/or dedicated balanced charges is highly recommend.
--
Zvika?
4Z1ZV