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Does Replacement Batteries Harm Cordless Tools, Or Just Not Worth the Savings in the Long Run? Answered


Should I stick to Makita HandBook for Cordless 18v LXT stating "Only use Makita Batteries and Charger", or go for the replacements?

Same goes for  "StepDown Transformers [220v to 110v] can harm tools etc...etc..."
I can dig the reason if it where for corded tools, but am I really jeopardizing my DC18RC 110v?

Which Replacement Batteries Do You Recommend?
Does it goes the same way for such rechargeable batteries (and chargers) that are made in China, that as the description specifies, made from China, so don't expect much?

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iceng
iceng

4 years ago

If the portable battery for your 18Volt DC tool is 19VDC or 17VDC then you are OK, only the shape and duration will be different.. (Every battery is DC = Direct Current)

Step down transformers are AC (Alternating Current)

DO NOT [NEVER] use AC on portable battery tools.

YES very much Harm from 110 VAC !!!

A 110 VAC is the RMS of a sine wave whose peak voltage changes from +156Volts to -156Volts 60 times every second and it will do horrible damage to your 18Volt DC Makita.. Maybe even start an explosive battery fire that water would not extinguish.

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GiladM1
GiladM1

Answer 4 years ago

Thanks for your efforts, but I'm afraid i'm been misunderstood.
Of course that:
- the alternative batteries will be compatible for the tool (Makita, BTW). but, are they harming the tool, or just decay fast and simply not economic.
- Didn't even crossed my mind to connect cordless tools to AC!
- I said I can understand if a power tool operating in 110v can be potentially damaged by 110v transformed from 220 by StepDown Transformers, but i think that a simple apparatus such as the charger wont be harmed, and if so in the far future, and even if so, the cost to replace will be moderate.

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iceng
iceng

Answer 4 years ago

OK I was confused and did not understand you were talking about two different things..

1) To answer your Question, most fractional electric motors can survive a momentary second of double voltage..

2) The motor can run continuously at 10% extra voltage..

3) The main concern is if the Makita electronic control can handle a battery that is 10% more voltage.

4) If you are worried about a battery that is the same voltage don't be concerned, it will not harm the operation of the motor...

5) One last problem is recharging a different chemistry battery.. A lithium charger may damage a Ni-Cad battery.. And a Ni-Cad charger does not do lithium batteries.. There are intelligent chargers that can do multiple chemistry batteries..

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Downunder35m
Downunder35m

4 years ago

It is recommended to use genuine replacements for some obvious reasons but if a good quality batttery pack is used or made there will be little to no difference.
Similar story for the chargers: A genuine one is designed to what is written on the package, a cheap replacement from china can do exactly the same but you never know...
Step down or buck converters that would bring your mains AC to a suitable DC voltage will work too but as the DC actually is not really a pure DC the "stray effects" can harm electronics that are sensitive.
And well, using mains power directly on a battery operated device results in a lot of smoke if you are lucky, in fire or worse if you have less luck.