Nice Job. To how much Voltage does the original 7,2-12V charger, charge up the batteries? The 4A BMS is probably way too small but I see the problem with limited space.
@@captainjim1010 Two years later, but allright haha. From what I understand it won't damage the batteries as long as the total capacity of the batteries is more than the voltage used in the standard batteries. It will charge up until target voltage is reached and will not use 100% of the batteries but also won't damage them
@@barthoebergen4631 ? ? ? ?.....well it seems to me, that your "understanding" of charger specs has some "gaps".......... // and my coment follows only 2 month's later than you spicy answer for "Whirled Peas" question......
Do not burn because the volts you give in addition (between 9.6v and 12v are 2.4v) represent 25% above normal operating current. In your case between 4,8v and 8v (which they give two cells in series) ie 4v in addition, it is about 65% over, and you can burn the motor drill. In your case, you'd better try with one cell ua-cam.com/video/73NY59sW4KQ/v-deo.html ,or change old ni-cd with new ones
No me cuadra algo si el taladro es de 9,6v para poner 6 baterías de litio que cada batería normalmente son cada una 3,7 v x 6 batería = 22,2 v no valdría y que yo sepa baterías de 1,6 v no existen
How are you going to charge the batteries fully? The charger only charges up to 11,2V and not the 12,6 you need to charge 3S pack fully. At 3,7V per cell they are only chaged about 75%
Hi! The bosch charger is 12v . Without the BMS 18650 Charger Protection Board, the 18650 battery can explode. The bosch charger can also give a higher voltage. You have to be carefully! See this image:ibb.co/mvOm25
The Bosch Charger is designed to charge 8S NiCd cells. One Cell has typically 1,2V. 8 x 1,2V=9,6V But the charging voltage is a little over 12V. So 12V :8 = about 1,5V each cell. 3S Lithium can be charged with up to 12,6V. So if the Bosch Charger does exactly 12V, the each lithium cell would be charged with 4V. But usually it's a little more than 12V. BMS with overcharge protection is necessary.
In my experience with PSR 7,2 battery, converting form 4Amp NiCad to Lit-Ion. The problem is the protect circuit. I bought some protect board from ebay. The 1st one work great and the seller said that was for modify 7.2v cordless tools and work perfect with PSR charger, it cost me $10. Even sometime failed to start the motor after 50% capacity. But it's ok because I have dozen of laptop battery for free. It's start failed after a year use, the controller cannot charge battery balance. I replace with 5Amp, 7Amp and 10Amp new protect board but never work like the 1st one that I was buy, 2 of them make my charger very hot. And Unfortunately I cannot found the 1st seller on ebay. So this week I replace the Lit-Ion battery with 12 x 1.2V 800mAh AA NiCad taken from my kid toys. I got 7.2V 1500mAh, but need modification with the battery pack case to fit all 12 AA battery to the case. IAll 12 Batttery cost me around $10, and work fine. I plan to replace with 7.2V 3000mAh RC toys battery that I was found on banggood.com last night.
Your problem is the use of laptop cells, not the bms. The voltage of laptop cells drops significantly under load. You need high drain cells who can deliver +20A continuous for 7.2-12V power tools and +15A continuous for 14.4V and up.
the BMS drops the current, but the motor needs more, I tried in the past and when I keep the mandrel to close the current exceed the 20A capability of my instruments, is 200W for a couple of seconds, the battery must be of hi current models, for charging 2 A is sufficient, or the regulator in the power supply will heat excessively :)
Аккумуляторы с батареи ноутбука не рассчитаны на отдачу больших токов, плата зарядки должна быть с балансиром.
Nice Job. To how much Voltage does the original 7,2-12V charger, charge up the batteries?
The 4A BMS is probably way too small but I see the problem with limited space.
I also
Como vc conseguiu abrir o suporte das baterias ?
Why use 6 batteries when you only need 12V? 6 x 3.6= 21.6V won't burn the machine?
What about the charger, it's meant for for Nicads, don't you have to modify that for Lithium ion batteries as well?
That is a very good question i want an answer to that as well
@@captainjim1010 Two years later, but allright haha. From what I understand it won't damage the batteries as long as the total capacity of the batteries is more than the voltage used in the standard batteries. It will charge up until target voltage is reached and will not use 100% of the batteries but also won't damage them
@@barthoebergen4631 ? ? ? ?.....well it seems to me, that your "understanding" of charger specs has some "gaps".......... // and my coment follows only 2 month's later than you spicy answer for "Whirled Peas" question......
Вчера разобрал свою АКБ бош-профессионал. Сколько там места!!! Сразу задумался об увеличении ёмкости
Great diy. Thumbs up!
Thanks
....how do i open the battery box...
they are usually platic welded, so basically you have no other option than to cut it
@@UltraNyan ooo ya ya..ok thanks...
You have used 3 Li ion cells in series giving 12 V while the rated voltage for the drill is 9.6 V this may result in burning the drill motor
Do not burn because the volts you give in addition (between 9.6v and 12v are 2.4v) represent 25% above normal operating current.
In your case between 4,8v and 8v (which they give two cells in series) ie 4v in addition, it is about 65% over, and you can burn the motor drill.
In your case, you'd better try with one cell ua-cam.com/video/73NY59sW4KQ/v-deo.html ,or change old ni-cd with new ones
Ihab Ahmed iyyyyTENEtnryjajajej e jeiwisij
I have exactly the same drill and i tried with the Li ion batteries and it didnt power up ... any clue why ?
9.6V is nominal voltage for 8 Ni-Cd's or Ni-Mh as is 11.1V for 3 Li-Ion 18650's.
The brushed motor can handle the little higher voltage, no problem.
No me cuadra algo si el taladro es de 9,6v para poner 6 baterías de litio que cada batería normalmente son cada una 3,7 v x 6 batería = 22,2 v no valdría y que yo sepa baterías de 1,6 v no existen
How are you going to charge the batteries fully? The charger only charges up to 11,2V and not the 12,6 you need to charge 3S pack fully. At 3,7V per cell they are only chaged about 75%
Hi! The bosch charger is 12v . Without the BMS 18650 Charger Protection Board, the 18650 battery can explode.
The bosch charger can also give a higher voltage.
You have to be carefully! See this image:ibb.co/mvOm25
The Bosch Charger is designed to charge 8S NiCd cells.
One Cell has typically 1,2V.
8 x 1,2V=9,6V
But the charging voltage is a little over 12V. So 12V :8 = about 1,5V each cell.
3S Lithium can be charged with up to 12,6V.
So if the Bosch Charger does exactly 12V, the each lithium cell would be charged with 4V. But usually it's a little more than 12V.
BMS with overcharge protection is necessary.
que bms 4-5 amperios,no va, debe ser al menos de 30 amperios, los taladros generan picos altisimos de Amperios
How much a shuld be the bms
Great!
Es mucho trabajo. Mejor un par de baterías 18650 y listo.
por donde cargaras las baterias, estudia bien el circuito
J thougt that lithim batery cant be charged on ni cd charger
Laptop batteries can't even handle my RC car .. How could they handle the drill? Probably died after few minutes..
Will not work on 20 amp BMS at full load
Hi
How many amps do you think would be enough?
@@CMCdiy 60 amp
60 amp
@@sach.ka.sath99 Yes, it is possible, I will try in the next projects.
Thank you for the advice
@@CMCdiy 20 amp BMS is 3 amp .40 amp is 6 amp 60 amp is 20 amp approx
In my experience with PSR 7,2 battery, converting form 4Amp NiCad to Lit-Ion. The problem is the protect circuit. I bought some protect board from ebay. The 1st one work great and the seller said that was for modify 7.2v cordless tools and work perfect with PSR charger, it cost me $10. Even sometime failed to start the motor after 50% capacity. But it's ok because I have dozen of laptop battery for free. It's start failed after a year use, the controller cannot charge battery balance. I replace with 5Amp, 7Amp and 10Amp new protect board but never work like the 1st one that I was buy, 2 of them make my charger very hot. And Unfortunately I cannot found the 1st seller on ebay. So this week I replace the Lit-Ion battery with 12 x 1.2V 800mAh AA NiCad taken from my kid toys. I got 7.2V 1500mAh, but need modification with the battery pack case to fit all 12 AA battery to the case. IAll 12 Batttery cost me around $10, and work fine. I plan to replace with 7.2V 3000mAh RC toys battery that I was found on banggood.com last night.
Your problem is the use of laptop cells, not the bms. The voltage of laptop cells drops significantly under load.
You need high drain cells who can deliver +20A continuous for 7.2-12V power tools and +15A continuous for 14.4V and up.
too low power 5A, my bosch 9,6V with 3 Sony VTC5 is triggering a 20A BMS.
herik63 . 5A for charging. Is directly related for discharge
the BMS drops the current, but the motor needs more, I tried in the past and when I keep the mandrel to close the current exceed the 20A capability of my instruments, is 200W for a couple of seconds, the battery must be of hi current models, for charging 2 A is sufficient, or the regulator in the power supply will heat excessively :)
You are right. I found on ali expres, 25A Li-ion 18650 BMS, very cheap. I'll try this
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usa cola quente. kkkk é mesmo à sapateiro.