Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: what is the life expectancy of a watch dog sump pump ?
Document: Also, recently I called the manufacturer here in Illinois with a question on how long battery life typically is. I got a call back within an hour and I was told 5 to 7 years life expectancy.
Heavy storms seem to be more frequent than a few years ago. I plan to explore the requirements of a water-driven, backup sump pump. The BWSP did everything I expected of it - battery life exceeded expectations, and the pump lasted longer than the typical 7 years seen with most pumps. I can't fault the pump for conditions that exceed its advertised capabilities.
After Hurricane Izabell on the East Coast seven years ago I purchased the Basement Watchdog battery backup sump pump for my own residence because I was basically scared to death of watching my finished basement float away just because the electricity was out. I purchased the "Big Dog" which is one step up and about $150 more than this model. I've had it for about 7 years and it has worked perfectly. This year we had Hurrican Irene on the East Coast and our power went out (AGAIN) for five days.
For the first time, the unit had triggered, and there was a light telling me to check the main pump. After resetting the alarm, it went off again when the backup pump again kicked in. The main AC sump pump's float switch was failing, but without the Basement Watchdog, I wouldn't have known until I'd stepped on a sodden basement carpet.
Basement Watchdog instructions are very specific, clear and comprehensive. Yes, you need to use their battery which costs around $130 or so, but they tell you this in no uncertain terms up front. It's a special deep cycle battery that requires acid at first then distilled water sometimes, but NO sump pump system is maintenance free so get used to it.
I checked it about 2 weeks ago. Last weekend we had heavy rains and basement is wet. Float switch on main sump pump failed, but the Basement Watchdog never took over. Never had any alarm sounding. All lights on the control panel are off and I can't get it to do anything.Don't buy this - it's gives you a false sense of security.
5 years ago when we moved into our current house, one of the first things I did was buy a Basement Watchdog backup sump pump to protect the fantastic finished basement that the previous owners had installed. As other reviewers have noted, the control panel beeps a couple of times a year to remind to add distilled water, or at least it did before I started putting battery-check reminders on my calendar.
Exposed battery plates aren't a good thing.5 years after installing the BWSP, an alarm displayed that the BWSP had cycled. I reset the alarm, but did nothing else. Several days later, the BWSP repeated the alarm, so I removed the sealed sump-pit cover and manually tripped the switch on the primary pump. It worked fine, so the next step was to pour water into the pit to test the primary.
Water in the sump pit was about 2 inches from the top, and rising. I had arrived home 'in the nick of time'. 30 minutes later, water would have been in the carpet of the finished basement. I hooked up a battery charger to the BWSP battery and the pump began emptying the sump pit. The battery was charged for 24 hours.The good news is the BWSP saved me from flooding - and having to deal with my insurance company - twice.
Basement Watchdog BWSP 1730 Gallons Per Hour Basement Watchdog Special Back-Up Sump PumpI'd never had a house with a sump pump until moving here in 2003  After about 2 months in my new home, and experiencing a heavy rain (2 inches in 30 minutes), I thought having a backup for the ground-water pump would be wise. I bought the Watchdog Basement Special (BWSP) at Home Depot along with the Watchdog battery.
Answer: yes