Hello, I have a dewalt dcb105 charger and two 18v dcb181 1.5ah and dcb185 1.3ah batteries One of them charges to 20.5v the other to 18v and the charger shows full charged. I checked the model charger and charged to 21v without a problem. But why doesn't the ori want to recharge? I checked all the contacts and it seems to be ok. There are contacts B + B- c1 c2 c3 c4 id and th. The charger is unscrewed and there is nothing burnt inside.
Only with the modeling charger I checked the capacity and it is 1.1ah from 1.5ah there are no big differences between the cells. In addition, the original charger does not indicate an error, but a full charge.
Still important topic? Basically, the battery has no protection - the package ends are led to terminals B + and B-. Clamps C1 ... C4 are connections of individual cells to the charger. Clamp C3 is used by the screwdriver, without it and clamp TH the screwdriver will not start. In my case, there was some crack or damage to the track on the pad of the C3 terminal, so the resistance was about 2k? (all C terminals must have a resistance of 0? to their points on the cell package - beware of the risk of a short circuit when measuring with an ohmmeter). After bridging with a cable, the screwdriver and charger came back to life. In addition, the battery has electronics for the ID terminal (I did not go into what purposes).
As for the protection, the battery plate is rosprolem and it turns out that besides the thermistor there is a smd 12w transistor and a bone of 8 legs hidden in the invisible part and the resistance on each c1, c2, c3, c4 measured between the battery contact and the cell sheets should be correctly 11ohm for each with 4 c resistors protect the cells in the event of a short circuit, because when they get hot, the cells will survive in the event of a short circuit, it is known how someone will close the contact + with the contact - it will release them anyway, but it is always more difficult in the bosch model, metabo hitaczi, you can also short-circuit and finish the package of cells if someone has such a whim, let's add an expensive whim and not that I am an expert as much as I am interested in solutions in professional equipment, it is my "horse" and not the one on the poles, I cordially greet everyone !!!!! I apologize in advance for spelling mistakes I am dyslexic and I have a document for it !!!!!! Added after 42 [minutes]: This 8-legged bone is a v6810a from what I figured these (capital) letters !!!!
And there are also on this de walt battery board two diodes on this side of the internal board and one diode on the outer side of the board, besides a few different smd resistors and smd capacitors, sorry, I could actually describe everything nicely step by step "pro publico bonno" I will try on the next one occasion !!!!! sorry for the possible spelling "dear group", best regards !!!!!!