Hi Roo hackers. I've got 3 battery shells for Roomba 400 model for sale cheap on eBay
. Sub-C batts are removed, but all other wiring, connectors, thermistors, case screws, etc. are included for someone who wants to rebuild with NiMh or Li-Ion cells. I hope these will be of use to someone!http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 1643525057
In my 2 Roo 400's I use a 3500 mAh NiMh, now almost 3 yrs old, and a Li-Ion "R4" from Lithium Power Inc, allegedly 4500 mAh, that's 13 mo. old. The promised increased run time with the lithium batt really hasn't been observed. Both run to 'yellow' display in about 45-50 minutes on bare concrete, 40" on carpet. The one clear advantage the li-ion batt has is much quicker charging and staying much cooler than the NiMh when charging.
Since both batt types and the internal charging components really dislike overheating, I've been charging them in the Roomba using a timer on the chargers: on for 15 min, off for 330 min -- 4 charge periods every 24 hours. In 15 min. the batts and Roomba case overlying the charge circuit only get slightly warm to the touch. And 330" is enough for everything to cool to room temp. I only run them once a week, so this has worked fine, and I hope will prolong life of the batts and the Roo internals!