BTX5L-BS, YTX5L-BS, CTX5L-BS Battery Equivalents and Replacements
BTX5L-BS batteries are small and compact cranking batteries very often used for starting small gas internal combustion engines in Powersports applications, for starting small power generators, lawn mowers, and for all other applications where the electric start of small engines is preferred over manual starting.
BTX5L-BS are also labeled as YTX5L-BS, CTX5L-BS, GTX5L-BS, PTX5L-BS, STX5L-BS, etc, with the YTX5L-BS being the most common one.
YTX5L-BS Battery Features and Specifications
YTX5L-BS battery features physical dimensions of 4.4375 x 2.75 x 4.125 inches (113 x 70 x 105 mm) and on average lead-acid YTX5L-BS battery features nominal voltage of 12 volts, nominal 10h capacity of 4 Ah and CCA rating between 65 and 80 Amps.
Most popular YTX5L-BS batteries are sealed, spill-proof, Absorbent Glass Mat (AGM) batteries - these batteries are practically maintenance-free batteries, very reliable, very resistant to vibrations and mechanical impacts (don't abuse this!) and they come at a very low price, justifying investing few dollars/euros more into more quality brands (Chrome, Weize, Everlast, Mighty Max, etc.).
YTX5L-BS battery features a positive terminal on the right side. Its nuts and bolts terminals ensure firm fit, just check periodically (every few months, depending on the use) be sure that there is no corrosion on the terminals.
YTX5L-BS AGM batteries weigh ~4 pounds (~1.8 kg) and represent almost no additional load for any Powersports vehicle - if those 4 pounds are of an issue, even lighter lithium-ion YTX5L-BS batteries may be used which weigh on average only 0.8 - 0.9 pounds (~0.36 - 0.41 kg) and are even able to crank slightly larger engines with their 100+ CCA.
Personally, unless You are a professional driver, You will hardly feel the ~3 pounds difference between AGM and lithium YTX5L-BS battery.
How to Charge YTX5L-BS Battery?
In most cases, AGM YTX5L-BS batteries are delivered almost fully charged and can be installed in the vehicle right away.
Once in the vehicle, a YTX5L-BS battery is being charged via an onboard charger (alternator) powered by the main engine.
However, if the battery is discharged and if it has to be recharged out of the vehicle, a smart AGM battery charger with the maximum charging current of 0.5-1.0 Amps is recommended. Stronger AGM battery chargers may recharge YTX5L-BS battery faster, but it is questionable if they can accept such charge without excessive overheating (some models can, but ...).
Also, such intelligent AGM battery chargers often feature maintenance mode - if the battery is going to be stored over a longer period of time, store it in the cool and dry area and connect it to the battery charger/maintainer.
Note: AGM battery chargers should not be used for charging lithium batteries unless they feature special lithium battery charging mode, or the lithium battery comes with the Battery Management System (BMS) that allows charging with AGM battery charger.
What Kills YTX5L-BS Battery?
If You have issues with the longevity with your YTX5L-BS batteries, note that there are few main reasons why YTX5L-BS battery may have a very short lifespan - and they usually come with a 1-year warranty, meaning that they are meant to last 1 year as Powersports battery.
These most common reasons are:
- battery is stored at high temperatures for a longer period of time without the battery maintainer - this may cause the buildup of lead-phosphate crystals on the lead plates which can warp the plates and can even short-circuit the battery cell.
- excessive vibrations and mechanical impacts can physically damage the battery, especially lead-plates. AGM batteries feature separators between the plates, and are much more vibration resistant than flooded/wet lead-acid batteries, but they are NOT indestructible!
- overcharging may also shorten the operating time of any battery. If You suspect that overcharging is killing your batteries, check the charging voltage of your vehicle while the engine is in idle, and while the engine is revved up - in both cases, the voltage on the battery terminals should not be above 15 volts.
Of course, there are other things that can 'kill' the battery, but these are the most common ones.
Long Story Short: BTX5l-BS, YTX5L-BS, CTX5L-BS, GTX5L-BS, PTX5L-BS, STX5L-BS, etc. batteries are very popular small starting batteries, they are reliable and are available in many car/hardware shops and online stores.
If possible, avoid wet/flooded batteries and go for AGM batteries of reputable brands.
Note: there are also some Gel-Cell batteries of this size as well, for example, Chrome Battery YTX5L-BS iGel (Amazon link, opens in the new window) that even comes with LCD screen, 70 CCA, 88 CA/MCA, 6 min Reserve Capacity and 18 months warranty - not bad for 4 lbs battery :)