Battery witchcraft

ponykilr

Guest
So I recently bought a battery powered backpack sprayer. A Chapin Pro that is powered by a Black and Decker 20V lithium battery. It is one of those "why didn't I buy this sooner" items. My old Chapin Pro backpack was hand pump and this one is unbelievably more convenient and less tiring.


All of my other tools are DeWalt and I looked high and low for some sprayer somewhere that uses DeWalt batteries.


There is no such animal.


So I bought the Chapin and loved it, except the fact that I now had to keep up with a different battery and charger.


So I resigned myself to my fate but I looked and looked for an adapter. It seems there are adapters on ebay that adapt every powertool to a different battery except..... No 20v B&D to DeWalt that I ever found. The fact that the battery is already on the bottom of the sprayer and would have an adapter and new battery hang lower than the frame aside, I wanted to get away from having different batteries.


Then, it happened. The charger for the B&D went haywire after only a month and would blink that the battery was too hot to charge even after putting it in the fridge for a spell.


Back to ebay.


I stumbled on a guy who 3D prints battery holder/receivers for 20V DeWalt batteries that have two 12g wire leads and nice heavy pins and construction for $16 + 3.50 shipping. I spoke with him on the phone and he thought my idea was good.


I would gut the B&D battery and attach the leads from his receiver to the pins in the old battery through drilled holes and mount the receiver on the frame. Voila! DeWalt powered sprayer.


Well it all worked as planned. A quick bracket and some soldering and drilling and it works like a charm. The bracket is double ziptied now but I plan to clamp it with wire clamps or even stainless hose clamps.


Battery witchcraft....



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I'm surprised at none of this. Amazon says that's a $139 sprayer, which is why they used the rechargeable battery from a low-end brand of power tool. You know it's an awesome product when it takes 3.5-4 hours to charge a battery that should take less than an hour if the battery internal resistance was lower because the batteries are higher quality. A better brand of battery and charger would have dramatically increased the price of the sprayer.
 
I know a guy that was for a while, replacing the battery's in the case. He had run across a case of rechargeable battery's, at a bargain price. I got a couple of B&D battery's done, before he ran out of the new replacements. I've never been good at soldering, but he Was. Saved a lot of $$, but he no longer can find the replacements. I think he just got tired of doing Everybody's battery pack!
 
Chris_Keziah said:
Is there anything in that for Low Voltage Cutoff?
Click to expand...
They guy that prints the receiver says to not let the battery get below one light. There is nothing in the sprayer and as far as I know nothing in DeWalt batteries to limit voltage drop. I never run my other DeWalt tools down to zero. This sprayer never ran down the crappy B&D battery so I know the DeWalt won't have a problem.

It is used for spraying roundup at customer's homes not for killing whole fields.
 
Of coyrse b&d owns dewalt...so are the batteries really any different?
 
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