Rechargeable Lithium Battery Link
Since most rechargeable lithium batteries are 3.7 volts or multiples series thereof I found this article to be useful https://learn.adafruit.com/li-ion-and-lipoly-batteries/voltages
Forum Discussion
Harvey51 wrote:
Where can Lithium cells be obtained? I have a Ryobi 18 V tool battery that will not run a tool despite being charged to 9.5 volts. I am told the circuit in the battery pack doesn't allow current to flow if there is a voltage differential over a tenth of a volt among the 6 cells. One weak cell kills the whole thing.
You DON'T wish to monkey with replacing individual lithium cells, you will not save money AND you will be taking a huge FIRE risk.
Generally Lithium cells ARE NOT SOLD to the general public since they require considerable amount of care in designing a proper charging system.. The only times I have found Lithium cells have been from Surplus electronic parts stores but I would not recommend playing with these since you will not have proper specs on charge and discharge ratings..
Lithium battery fires are extremely hot, well over 2500 F and these batteries is miss used, broke open, overcharged, over discharged or physically damaged WILL result in severe damage.. so they really are not something the average person will want to mess with.
You are better off buying complete NEW battery packs.
You can get new 18V packs for your Ryobi for about $34 each which is a bargain compared to a lithium fire..
RYOBI BATTERY PACKS
