ryobi

[rtrg]

Please move as needed. Can a RYOBI 18 volt pack of either NICAD or LI ION be charged using the 113,114,115 chargers if the TEMP sensor is missing? I rebuilt a number of them using LI ION cells with out the temp sensor simply because the charger I use has a PIG TAIL with sensor attached
that can be taped to the NECK. The standard charger depends on the T TAB for contact. The charger does go into trickle mode when completed charge but the indicators do not function in the same way. I pull the battery after an hour and measure at the NECK. Works but is annoying. I made my own FEMALE NECK to make the connection. I would prefer to use my 113. I can depend on the indicators. Any advice welcome. I ran a wire and attached SENSOR to tape to the neck but it seems not to work that way despite the fact that the OTHER charger DOES.

 

[shortylickens]

Yeah this is the wrong forum. I'm thinking Highly Technical may be able to help you.


http://forums.anandtech.com/forumdisplay.php?f=22

 

[pm]

Moved to Highly Technical
Moderator PM

 

[rtrg]

Moved to Highly Technical
Moderator PM

Thanks. Maybe someone there can answer my question.

 

[shortylickens]

Also, your title is kinda vague which may be why no one has responded. Change it to Ryobi Battery charger rebuild.

 

[pm]

About my only guess is that thermal sensors are usually diodes and diodes are direction-specific. Try flipping the thermal sensor connection the other way.

 

[bryanl]

The 3rd tab for Ryobi nicads is for a bimetal hi-temp thermostat inside the battery. I don't know what it does in Ryobi lithiums, but I suspect it's a thermistor that only prevents charging of batteries that are too hot or too cool and is not used for controlling normal charging, which is instead metered according to battery voltage.

 

[rtrg]

From what you said am I correct in presuming that you think I could use my third party non RYOBI 2 wire charger with TEMP sensor attached to a pigtail and tape it to the NECK and discinnect after 1 or 2 hours? As it is a QUICK charger.

 

[bryanl]

I believe you can charge it safely (under normal circumstances - no defective cells), but watch temperatures, and I would prefer to first compare battery temperatures generated by a factory lithium charger for a Ryobi or other cordless tool. I would also like to know how your fast charger senses and regulates charge state since some chargers are not particularly sophisticated in this respect, including the non-lithium Ryobi models. Lithiums can explode hard.

 

[rtrg]

I have rebuilt a couple of packs using LI ION 4400 ma cells. All 15 packed into the shell, no neck cell, only the +/- tabs/wires. The charger in question is a "POWERIZER" brand model #ho2400918-us-1. Charge current .09a or 1.75 a in auto mode. One GREEN/RED indicator, one pigtail with temp sensor attatched, one carge cable attached. I replaced the alligator clips with a matching NECK from a dead tool. Polarity is fool proof. Charger inspects battery, starts at 1.75, moves to .9 the GREEN indicator lights at full. One to two hours. Pack is typicly warm. Themp sensor and battery gauge removed. Charger seems to work properly. I am concerned that the detachable TEMP sensor is working as it should. As an experiment, I rann a wire with temp sensor attached from my spare P113 charger, and attached it to the neck. The pack will not charge at all, but WILL charge on the unaltered P113. Apparent ly either the sensor is the wrong one, or rge TAB is neede to make contact with the sensor circuit. A mystery to me. As long as I am not doing any damage to my cells I quess I answered my own question.