The circuitry in these generic battery packs for the unbranded cordless power tools on eBay is actually OK. Given that you can usually purchase an extra battery with a kit for just £5 more it does make me consider how much markup the prominent brand names like DeWalt, Makita, Milwaukee and others are making on their "consumable" batteries. Even with prominently branded cells it doesn't justify over ten times the price.

The design of this unit is similar to the Ryobi batteries in that it contains the battery protection circuitry, and can cut off power to the load directly. This actually makes them very viable for use in other custom applications. Many other brands rely on the tool to cut off the power draw when the battery signals it. The reason the Ryobi batteries have this feature is because they are backward compatible with tools that were intended for use with NiCd cells.

The chip seems to have been aimed at these packs, and it's most basic schematic is breathtakingly simple. I wonder if they've added the filtering circuitry for greater voltage monitoring stability with high current peaky loads associated with power tools.

I'll take the new chainsaw apart in another video. My general experience with generic power tools so far is that they perform exceptionally well for their low cost. I'd guess they're probably used by Chinese construction workers.

The charger will also get its own video. I'll guess it's a very basic switchmode supply with opto feedback and probably charge status indication monitored by sensing the voltage drop across a current limiting resistor.


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