Resurrect an old screwdriver. How to get free working battery

Native battery died. Separately, the batteries are, as a new screwdriver assembly. But this is not a reason to collect the money and run to the store. We will resurrect the old battery. This will require an hour of free time and the tools that I am sure everyone has a home. This reincarnation I did working screwdrivers. When me he otpahal year and a half. Perhaps she is today. It's time to fix the home screwdriver. Go.

Diagnostics

Charges two batteries as possible. Immediately after that they accurately understand. In my case, part of the body are connected by screws, but they may also be glued together. Remove the insulators and get here are the battery assembly.

*Photographing the assembly top and bottom. If you have to disassemble it in the elements, we are left with the scheme of the factory battery connection. This greatly saves time.*

Multimeter measures voltage of each cell and write the reading pencil on the housing. If they are significantly smaller than the nominal or zero - battery cell is discarded.

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After about half an hour to check the battery self-discharge. Re-measure the voltage. If it has fallen significantly - the battery unusable.

For greater precision can be connected to the terminals of a multimeter resistance (resistor). In my case, the battery 20 is fully turned 10 dead. Therefore, choose the best of what was not.

*Check the efficiency of the batteries.*

Surgical intervention

We decided on a non-working elements. The battery, in which there are more going to recover. The second would be the donor. The main thing is to have enough working storage elements. Gently separate them in the spot welding locations and prepare for subsequent assembly.

One of the connecting plates I cut. Then each element can be rotated at the required angle. In the place of separation undertake pliers for the plate as close as possible to the welding and screw it onto the sponge. Welding easily flies. The plates are separated from unusable batteries.

**Pliers pivoted relative to the battery and the plate flies.**

Something important about soldering

It remains to solder the individual elements of the assembly. The trouble is that the batteries do not suffer overheating and quickly zaludit their conventional solder will not work.

Ham radio is often criticized acid flux, but here not do without it. I use the F-38H. Apply it to the surface for a few seconds and touch warmed soldering iron. This is enough to place zaludit adhesions.

Acid flux should definitely wash. Otherwise, the metal corrodes over time.

My attempts to find out how to properly wash away the acid flux without success. The manufacturer says that it must be removed mechanically or with plenty of water. I doubt that you can mechanically treat the entire surface thoroughly. also do not want to rinse your batteries under the tap. Therefore, I act differently.

At school chemistry I was taught that the acid is neutralized with alkali to form salt and water. The most accessible alkali - aqueous solution of baking soda. After soldering nanoshu it to the surface and wash the remains of a cotton swab. If you know the correct way to wash more, please share in the comments.

Contact tinned. battery connections are brazed to meet circuit. The main thing they do not overheat. Touch a soldering iron for a few seconds. This is enough to melt the solder.