Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: I have an apc 350 es   UPS ,I opened it and it only has the APC sticker on it, no further numbers , what replacement battery should I order
Document: I used this to replace the battery in my APC BACK-UPS ES 350. It fit perfectly and I encountered no problems during installation.It's been installed for a couple of months and has been working fine. This is obviously a much less expensive solution to a dead UPS than buying a new one.
I was afraid I'd have to buy a new APC Back-UPS when mine recently stopped working, but I ordered this replacement battery, and voila--my battery backup functions again. And for far less money than the brand-name. It was simple as taking the battery cover off the bottom of the thing, removing the old battery, and putting in the new one.
The batter was an exact replacement for the original APC battery. Easily installed in the UPS unit. The battery is a great value.
It does the job without any issues. It is a perfect fit. Don't throw out your APC UPS device when the battery fails. Buy a replacement battery based upon the DC current, physical size, and shape requirements. The price was also good.
Was very apprehensive about purchasing... but now, I couldn't be happier! Don't hesitate in purchasing this battery as an APC replacement, go for it!! !
Still, it's worth taking a second to eyeball the connection polarity as you take the old battery OUT. (I should also say, APC designed the battery compartment of the BE350R to allow easy battery replacement without tools, just a click-open/slide-open cover and quick-disconnect terminals -- thumbs up to them for that.
I asked the vendor if they had .187" to .250" terminal adapters and they offered to add them into my order for free. (As an aside-- the terminals connect up fine without the adapters, I tried it, but the connections will be more reliable, long term, with the adapters in there. )Last part: I charged the new battery for 12 hours in the UPS & then hooked a lamp up to the UPS and pulled the wall plug.
I didn't time how long it held power; it held fine for several minutes before the UPS beeping drove me crazy (unfortunately I haven't figured how to silence this UPS).Summary-- it's great replacement battery at a nice price. And the vendor (Chrome) deserves high marks too.
This is first time I have used this particular brand, but in decades of UPS use across multiple PCs & 4 UPS systems for the non-laptops in the house I have never regretted buying an equivalent non-factory replacement for this type of battery product/application.
I've thrown out the whole UPS in the past then came across these batteries. Easy to replace and so far works well. Never can tell how good a battery is until it fails and you know how long it lasted. Unfortunately I first ordered the wrong one intended for the next larger size unit and couldn't return it since its sissified as hazardous freight so make sure you match up the product numbers.
Answer: RBC35 battery replacement fits perfectly on the APC 350ES.  I didn't have any problems with it.  The dimensions were the same; however, the negative and positive prongs were smaller than the original battery.  I had to use a pair of pliers to make it tighter.