Tex
New Member
- Joined
- Dec 16, 2019
- Messages
- 82
Ok,
This is giving me a headache!
As I have access to a supply of new 2600 mAh 18650 cells for free I have started getting into converting some of my old power tools etc.
One of the first projects I did was to convert a Bosch portable vacuum cleaner.
I put 4 cells of these 2600 mAh cells together (soldered) with with an RC alarm plugged into a balance lead, and a switch to isolate it when not being used, worked pretty good. I then bought a Accucell S60 hobby charger with balance port to charge it.
After that I acquired another lot of cells, so I also bought an Opus BT-C3100 cell tester/charger, a Sequre SQ-SW1 spot welder with foot pedal and some nickel strip, and several different flavors of BMS boards, so I was ready to rock and roll.
I then built a new 4S4P battery pack with a 20 amp BMS board, which just fitted in the little vacuum to double to battery size from the original 4.
I removed the switch and made a recessed charging port from an EC3 Dean plug, all installed and tested works a treat.
Soooo, here is my stupid question, my brains says 4S x 4P @ 2600 mAh per cell = 14.4 volts / 10.4 amps. (nominal), correct?
Secondly, the spec for these cells says Charging (CC) C rate 0.5C – 1.3A (per cell) – x 4 = 5.2 amps? or is it by 8?
And the Charging voltage spec says voltage: 4.2v max. (per cell) x 4 = 16.8v. or is it by 8?
That's my issue, I suspect it's by 4 for both specs.
Unfortunately it appears my Accucell S60 hobby charger won't charge anything without a balance plug, but I do have a Victron 10 amp charger for my 200 amp hour LiFePO4 battery which I thought might do the job but I suspect not.
I do have an HP 18 volt x 2.23 Amp power adapter, I think that might be the go?
I just can't seem to get it clear in my head, any help would be appreciated.
Cheers
Tex
This is giving me a headache!
As I have access to a supply of new 2600 mAh 18650 cells for free I have started getting into converting some of my old power tools etc.
One of the first projects I did was to convert a Bosch portable vacuum cleaner.
I put 4 cells of these 2600 mAh cells together (soldered) with with an RC alarm plugged into a balance lead, and a switch to isolate it when not being used, worked pretty good. I then bought a Accucell S60 hobby charger with balance port to charge it.
After that I acquired another lot of cells, so I also bought an Opus BT-C3100 cell tester/charger, a Sequre SQ-SW1 spot welder with foot pedal and some nickel strip, and several different flavors of BMS boards, so I was ready to rock and roll.
I then built a new 4S4P battery pack with a 20 amp BMS board, which just fitted in the little vacuum to double to battery size from the original 4.
I removed the switch and made a recessed charging port from an EC3 Dean plug, all installed and tested works a treat.
Soooo, here is my stupid question, my brains says 4S x 4P @ 2600 mAh per cell = 14.4 volts / 10.4 amps. (nominal), correct?
Secondly, the spec for these cells says Charging (CC) C rate 0.5C – 1.3A (per cell) – x 4 = 5.2 amps? or is it by 8?
And the Charging voltage spec says voltage: 4.2v max. (per cell) x 4 = 16.8v. or is it by 8?
That's my issue, I suspect it's by 4 for both specs.
Unfortunately it appears my Accucell S60 hobby charger won't charge anything without a balance plug, but I do have a Victron 10 amp charger for my 200 amp hour LiFePO4 battery which I thought might do the job but I suspect not.
I do have an HP 18 volt x 2.23 Amp power adapter, I think that might be the go?
I just can't seem to get it clear in my head, any help would be appreciated.
Cheers
Tex