speaking of batteries

pyotr filipivich · 2018-02-23T02:48:56+00:00

Speaking of batteries How does one go about testing to see if a second hand set of Ryobi 18v batteries are still "good"? These are the green ones, I am not sure right now what type they are (Lithium Ion, Ni-Cad, Auto-Cad, Alkaline, or Iron-Pyrite) but I am not sure if they need replacing or not. I got them, and the charger, and three tools at a thrift shop. "Guarenanteed not to rip, rot, rust bust or throw dust - thirty feet or thirty seconds provided the customer does not fool with them." {"Did you charge the batteries?" Of course I charged the batteries! "I told you not to fool with them!" (OTOH, could be that I was over expecting how much use I could get of a pair in the circ-saw cutting oak pallets.) But anyway, testing procedures for batteries? Or just bite the wax tadpole and get replacements? tschus pyotr

Feb 23, 2018 21 Replies

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MOP CAP 8 years ago

Been there done that. You might try snipped-for-privacy@gmail.com. He makes adaptor kits to use older 18 volt tools with the 20 volt Li. As long a you still have an old Sears to go with the kit. You could pick a new 20 volt system for batteries. CP

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Brewster 8 years ago

It really depends on the quality of the cells used. My rebuilds are still running fine, I expect to get about the same service life as the originals.

A LI rebuild would have been nice, but then you need the LI compatible charger which I don't have. At that point, it would have made more sense to just get a new drill kit

My first "self" rebuild was a battery pack for a 1990's vintage Makita drill with a 9.6v NiCad pack. I bought a HF replacement pack on sale for next to nothing and dutifully rebuilt the Mikita with the HF cells. It died after maybe three charges. Turned out, the HF batteries were for a wall-wart style trickle charger and my 1-hour Makita charger fried them. A lot of "sub" classes under the NiCad, NMHyd, and LI street names 8^)

The second attempt was with RC car batteries, designed for abuse and fast charging rates. Worked like a champ, but the cost and effort was a wash.

=BR

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