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  • Dremel MultiPro Cordless Model 770 Type 1 - Battery Pack Repair

    Great Instructable. I have been rebuilding battery packs for scientific instruments for about 25 years and in spite of what you have been told, you can replace NiCad AA cells with rechargeable NiMH cells available in any hardware store, camera store or drug store. The advantage of NiMH cells (which have the same voltage as the NiCads - 1.2 volts) is that they are more readily available and have higher power density than the NiCads. The disadvantage is that you will get fewer charge/discharge cycles our of them before the battery has to be rebuilt again - about 300 cycles for an NiMH vs. 500 for a NiCad cell. I use the same charger as for the NiCads. i.e. the charger that came with the equipment. Because of the higher power density you will get about twice the run time on a charge as you...see more »Great Instructable. I have been rebuilding battery packs for scientific instruments for about 25 years and in spite of what you have been told, you can replace NiCad AA cells with rechargeable NiMH cells available in any hardware store, camera store or drug store. The advantage of NiMH cells (which have the same voltage as the NiCads - 1.2 volts) is that they are more readily available and have higher power density than the NiCads. The disadvantage is that you will get fewer charge/discharge cycles our of them before the battery has to be rebuilt again - about 300 cycles for an NiMH vs. 500 for a NiCad cell. I use the same charger as for the NiCads. i.e. the charger that came with the equipment. Because of the higher power density you will get about twice the run time on a charge as you would with NiCads. I fasten the cells together using the metal strips pulled off of the defective NiCad packs, but if there is room, you can also use hookup wire for this. NiMH AA cells come in different power ratings, up to 2800 mAH (Milliamp-Hours). Get the highest rated cells you can find, for maximum run time.

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