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IBM 08K8190 10.8V Li-Polymer Battery for ThinkPad Ultrabay Slim | 
 enlarge | Brand: IBM
Category: CE
List Price: $124.99
Buy New: $79.00
You Save: $45.99 (37%)
New (19) Used (3) from $45.00
Rating:  4 reviews
Media: Electronics
Memorabilia: No
Shipping Weight (lbs): 1
Dimensions (in): 7.1 x 9.2 x 0
Warranty: 1 year warranty
MPN: 08K8190
Model: 08K8190
UPC: 087944873556
EAN: 0087944873556
ASIN: B000098V6H
Availability: Usually ships in 1-2 business days
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Product Description
ThinkPad T40 Series customers with extended unplugged power needs will want to consider keeping an extra battery in the Ultrabay Slim device bay.The ThinkPad Ultrabay Slim Li-Polymer Battery is a rechargeable battery, which can be used in the Ultrabay Slim of the ThinkPad T40 Series. Adding this battery to your system extends your unplugged usage time. For maximum unplugged operating time, customers will want both the ThinkPad T40 Series High-Capacity Li-Ion Battery and the ThinkPad Ultrabay Slim Li-Polymer Battery. This battery has an output of 10.8V and can be recharged in 2.8 to 4.0(1) hours, depending on the ThinkPad system usage.
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| Customer Reviews:
 Don't Buy! December 31, 2008
m2n (California United States)
Your Thinkpad will always *completely* drain the Ultrabay battery before going to the primary battery. This will dramatically reduce the lifespan of the battery. My Ultrabay battery dropped to 30% capacity within 4 months, replaced it on warranty, and now is at 50% capacity.
 Limited life June 19, 2008
Josh Daniel S. Davis (Lake Dallas, TX)
1 out of 1 found this review helpful
Li-PO batteries have limited life through recharges and on the shelf. My first battery lost 35% of its capacity within 4 months and 9 cycles. My second battery lost 35% of its capacity within 6 months and 12 cycles.
When new, the batteries add 30-50% battery life, compared to the main battery. The Thinkpad power board will fully discharge the ultrabay battery before using the main battery. Also, the power board will fully charge the main batter before charging the ultrabay battery. As such, the battery routinely goes from full to zero to full, which is very hard on LiPO batteries.
The real benefit of this battery is when travelling, or otherwise operating with a need for maximum battery life without lugging extra components. Alternatively, this could be used to allow you to swap main batteries without hibernating.
Since the warranty is up on mine, it's fairly unlikely that I will acquire another one of these. It's more likely I'll purchase an additional 9-cell battery and deal with hibernate on swap.
 Expensive but convenient November 30, 2007
dgies (California)
3 out of 3 found this review helpful
Gives about a 50% boost to battery life without needing to carry spares. Replaces the optical drive which I find I rarely need on the road. Somewhat expensive.
 Not useful. January 16, 2007
Qiu Zhou
3 out of 14 found this review helpful
The ultrabay battery is always used first before using the external one and it is only 3-cell battery.
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